; HLPIBLED ;--------------------------------------------------------------- ;! Interactive Baseline based visibility Editor - run-time help ;# TASK UV VLBI CALIBRATION INTERACTIVE TV-APPL ;----------------------------------------------------------------------- ;; Copyright (C) 1995, 1997, 2002, 2007, 2016 ;; Associated Universities, Inc. Washington DC, USA. ;; ;; This program is free software; you can redistribute it and/or ;; modify it under the terms of the GNU General Public License as ;; published by the Free Software Foundation; either version 2 of ;; the License, or (at your option) any later version. ;; ;; This program is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;; GNU General Public License for more details. ;; ;; You should have received a copy of the GNU General Public ;; License along with this program; if not, write to the Free ;; Software Foundation, Inc., 675 Massachusetts Ave, Cambridge, ;; MA 02139, USA. ;; ;; Correspondence concerning AIPS should be addressed as follows: ;; Internet email: aipsmail@nrao.edu. ;; Postal address: AIPS Project Office ;; National Radio Astronomy Observatory ;; 520 Edgemont Road ;; Charlottesville, VA 22903-2475 USA ;----------------------------------------------------------------------- C----------------------------------------------------------------------- OFF ZOOM This option resets any zoom factors and zoom center. The image is actually shown in zoom only during flagging operations (where zoom may help you point more accurately) and during the setting of the zoom by TVFIDDLE. C----------------------------------------------------------------------- OFFZOOM This option resets any zoom factors and zoom center. The image is actually shown in zoom only during flagging operations (where zoom may help you point more accurately) and during the setting of the zoom by TVFIDDLE. C----------------------------------------------------------------------- OFF ENHANCEMENT This option turns of any black-and-white and color enhancements done in TVFIDDLE. C----------------------------------------------------------------------- OFFENHAN This option turns of any black-and-white and color enhancements done in TVFIDDLE. C----------------------------------------------------------------------- TVFIDDLE This option allows you to set the zoom factor and center to blow up the data plot for more accurate cursor positioning. It also allows you to alter the look-up-tables. The only visible effect of this, so far, is to turn the upper plot red. C----------------------------------------------------------------------- ENTER AMP RANGE This option allows you to enter on your terminal the lower and upper ranges of the amplitude to be displayed. The default is to display the full range of values. Having entered an amp range, you may return to the default by entering an amp range of 0 0. C----------------------------------------------------------------------- AMP RNGE This option allows you to enter on your terminal the lower and upper ranges of the amplitude to be displayed. The default is to display the full range of values. Having entered an amp range, you may return to the default by entering an amp range of 0 0. C----------------------------------------------------------------------- ENTER PHS RANGE This option allows you to enter on your terminal the lower and upper ranges of the phases to be displayed. The default is to display the full range of values. Having entered a phase range, you may return to the default by entering a phase range of 0 0. C----------------------------------------------------------------------- PHS RNGE This option allows you to enter on your terminal the lower and upper ranges of the phases to be displayed. The default is to display the full range of values. Having entered a phase range, you may return to the default by entering a phase range of 0 0. C----------------------------------------------------------------------- ENTER DCR RANGE This option allows you to enter on your terminal the lower and upper ranges of the decorrelation to be displayed. The default is to display the full range of values. Having entered a decorrelation range, you may return to the default by entering a decorrelation range of 0 0. C----------------------------------------------------------------------- DCR RNGE This option allows you to enter on your terminal the lower and upper ranges of the decorrelation to be displayed. The default is to display the full range of values. Having entered a decorrelation range, you may return to the default by entering a decorrelation range of 0 0. C----------------------------------------------------------------------- ENTER IF If you have more than one IF in your master file, this option lets you select which one will be displayed and used in editing. If flags are to be applied to a single IF, they are applied to the IF selected with this option. If there are 2 IFs, the task simply switches them; if there are more than 2, then the task prompts you to enter the desired IF. The data are NOT immediately reloaded, allowing you to make other selections before loading. Use the LOAD option if needed to force the desired IF to appear. An additional status line near the bottom of the TV screen will display what the "next load shows". C----------------------------------------------------------------------- SEL IF If you have more than one IF in your master file, this option lets you select which one will be displayed and used in editing. If flags are to be applied to a single IF, they are applied to the IF selected with this option. If there are 2 IFs, the task simply switches them; if there are more than 2, then the task prompts you to enter the desired IF. The data are NOT immediately reloaded, allowing you to make other selections before loading. Use the LOAD option if needed to force the desired IF to appear. An additional status line near the bottom of the TV screen will display what the "next load shows". C----------------------------------------------------------------------- ENTER STOKES If you have more than one Stokes or polarization in your master file (i.e. I/Q/U/V, or RR/LL/RL/LR, or XX/YY/XY/YX), this option lets you select which Stokes is displayed and used in editing. If there are 2 polarizations, this option simply switches the selected one. If there are more than two, the task prompts you to enter the desired polarization. The data are NOT immediately reloaded, allowing you to make other selections before loading. Use the LOAD option if needed to force the desired Stokes to appear. An additional status line near the bottom of the TV screen will display what the "next load shows". C----------------------------------------------------------------------- SEL STKS If you have more than one Stokes or polarization in your master file (i.e. I/Q/U/V, or RR/LL/RL/LR, or XX/YY/XY/YX), this option lets you select which Stokes is displayed and used in editing. If there are 2 polarizations, this option simply switches the selected one. If there are more than two, the task prompts you to enter the desired polarization. The data are NOT immediately reloaded, allowing you to make other selections before loading. Use the LOAD option if needed to force the desired Stokes to appear. An additional status line near the bottom of the TV screen will display what the "next load shows". C----------------------------------------------------------------------- RATIO 2ND IF If you have more than one IF in your master file, this option lets you select a special mode in which the ratio of 2 IFs is displayed rather than either one individually. If the 2nd IF number selected differs from the first, then ratio of the first to the second will be displayed and used in editing. If flags are to be applied to a single IF, they are applied to the first IF. If there are 2 IFs in the data, then this option simply switches the second IF. If there are more than 2, then the task will prompt you to enter the desired second IF. The data are NOT immediately reloaded, allowing you to make other selections before loading. Use the LOAD option if needed to force the desired IFs to appear. An additional status line near the bottom of the TV screen will display what the "next load shows". C----------------------------------------------------------------------- RATIO IF If you have more than one IF in your master file, this option lets you select a special mode in which the ratio of 2 IFs is displayed rather than either one individually. If the 2nd IF number selected differs from the first, then ratio of the first to the second will be displayed and used in editing. If flags are to be applied to a single IF, they are applied to the first IF. If there are 2 IFs in the data, then this option simply switches the second IF. If there are more than 2, then the task will prompt you to enter the desired second IF. The data are NOT immediately reloaded, allowing you to make other selections before loading. Use the LOAD option if needed to force the desired IFs to appear. An additional status line near the bottom of the TV screen will display what the "next load shows". C----------------------------------------------------------------------- SHOW TOP PLOT This option toggles the flag controlling whether all of the data for the current baseline is displayed at the top of the screen. The plot will be turned off immediately, but it may be able to reappear only the next time the screen is reloaded. You can force a reload by selecting the LOAD option. The top plot is required for the SELECT FRAME option and is used to display also the currently selected frame area. However, updating the plot can be time consuming, so you may wish to turn it off. C----------------------------------------------------------------------- TOP PLOT This option toggles the flag controlling whether all of the data for the current baseline is displayed at the top of the screen. The plot will be turned off immediately, but it may be able to reappear only the next time the screen is reloaded. You can force a reload by selecting the LOAD option. The top plot is required for the SELECT FRAME option and is used to display also the currently selected frame area. However, updating the plot can be time consuming, so you may wish to turn it off. C----------------------------------------------------------------------- PLOT MODEL This option toggles the flag controlling whether the data are displayed with a connected-line drawing of the model amplitude.. This option works only if a model was provided via the NMAPS and IN3NAME adverbs and works only for amplitude. The model plot is not drawn or removed until the next time the screen is reloaded. You can force a reload by selecting the LOAD option. C----------------------------------------------------------------------- PLOT ERROR BARS This option toggles the flag controlling whether the data are displayed with an estimate of the associated error bars or with a short constant bar. This option works correctly only if the weights in the data set are calibrated to provide an approximate measure of the amplitude uncertainty. This flag is ignored while plotting decorrelations. This option goes into effect the next time the screen is reloaded. You may force a reload by selecting the LOAD option. When error bars are displayed, an additional status line near the bottom of the TV will display this fact. When error bars will change with the next LOAD, a status line is used to report this. C----------------------------------------------------------------------- ERR BARS This option toggles the flag controlling whether the data are displayed with an estimate of the associated error bars or with a short constant bar. This option works correctly only if the weights in the data set are calibrated to provide an approximate measure of the amplitude uncertainty. This flag is ignored while plotting decorrelations. This option goes into effect the next time the screen is reloaded. You may force a reload by selecting the LOAD option. When error bars are displayed, an additional status line near the bottom of the TV will display this fact. When error bars will change with the next LOAD, a status line is used to report this. C----------------------------------------------------------------------- SWTCH 1-CH FLAG This option lets you toggle between having the following flag commands apply to all spectral channels and having them apply only to the current spectral channel. The status line on the bottom of the TV reflects the current value of this option. C----------------------------------------------------------------------- 1-CH FLG This option lets you toggle between having the following flag commands apply to all spectral channels and having them apply only to the current spectral channel. The status line on the bottom of the TV reflects the current value of this option. C----------------------------------------------------------------------- SWTCH 1-IF FLAG This option lets you toggle between having the following flag commands apply to all IFs and having them apply only to the current IF. The status line on the bottom of the TV screen reflects the current value of this option. C----------------------------------------------------------------------- 1-IF FLG This option lets you toggle between having the following flag commands apply to all IFs and having them apply only to the current IF. The status line on the bottom of the TV screen reflects the current value of this option. C----------------------------------------------------------------------- SWTCH 1-SO FLAG This option lets you toggle between having the following flag commands apply to all sources and having them apply only to to the source of the displayed data. The status line on the bottom of the TV reflects the current value of this option. This affects flagging of time ranges primarily, and determines whether all sources in the range or only those actually displayed by IBLED are to be flagged. C----------------------------------------------------------------------- 1-SO FLG This option lets you toggle between having the following flag commands apply to all sources and having them apply only to to the source of the displayed data. The status line on the bottom of the TV reflects the current value of this option. This affects flagging of time ranges primarily, and determines whether all sources in the range or only those actually displayed by IBLED are to be flagged. C----------------------------------------------------------------------- SET STOKES FLAG This option lets you specify which polarizations are to be flagged by the following flag commands. You will be prompted for a Stokes string or flag mask, i.e., 1111 will flag all four Stokes parameters, 1001 will flag RR and LR. The status line on the bottom of the TV reflects the current value of this option. C----------------------------------------------------------------------- STKS FLG This option lets you specify which polarizations are to be flagged by the following flag commands. You will be prompted for a Stokes string or flag mask, i.e., 1111 will flag all four Stokes parameters, 1001 will flag RR and LR. The status line on the bottom of the TV reflects the current value of this option. C----------------------------------------------------------------------- FLAG station-ID where station-ID is actually replaced with the name of station of the first or second antenna in the current baseline. This option allows the user to switch between applying the following flag commands only to the currently displayed baseline and applying them to all baselines containing this antenna. When the latter is chosen, an additional status line near the bottom of the TV will display this choice. C----------------------------------------------------------------------- FL stnn where stnn is actually replaced with the name of station of the first or second antenna in the current baseline. This option allows the user to switch between applying the following flag commands only to the currently displayed baseline and applying them to all baselines containing this antenna. When the latter is chosen, an additional status line near the bottom of the TV will display this choice. C----------------------------------------------------------------------- FLAG TIME Move the cursor to the point you wish to flag. The vertical line will follow it while the source, time, and flux of the point under the cursor will be displayed in the top left corner of the TV. Once on the desired time, hit button A or B to flag that time and loop for more, hit button C to flag the time and return to the menu, and hit button D to return to the menu with no further flagging. C----------------------------------------------------------------------- FG TIME Move the cursor to the point you wish to flag. The vertical line will follow it while the source, time, and flux of the point under the cursor will be displayed in the top left corner of the TV. Once on the desired time, hit button A or B to flag that time and loop for more, hit button C to flag the time and return to the menu, and hit button D to return to the menu with no further flagging. C----------------------------------------------------------------------- FLAG TIME RANGE Move the cursor to the start time of the range you wish to flag; the vertical line will follow. Hit button A to set the start time and a second vertical line will appear 10 pixels to the right. Move the cursor to the end point of the desired time range; the second line will follow. Hit button A to switch between the begin and end times; hit button B to edit the data in the specified range and loop to set another time range; hit button C to edit the data and return to the menu; or hit button D to return to the menu with no further flagging. C----------------------------------------------------------------------- FG T.RNG Move the cursor to the start time of the range you wish to flag; the vertical line will follow. Hit button A to set the start time and a second vertical line will appear 10 pixels to the right. Move the cursor to the end point of the desired time range; the second line will follow. Hit button A to switch between the begin and end times; hit button B to edit the data in the specified range and loop to set another time range; hit button C to edit the data and return to the menu; or hit button D to return to the menu with no further flagging. C----------------------------------------------------------------------- FLAG AREA Move the cursor to the lower-left corner of the area you wish to flag (the box will follow the cursor). Once at the desired point, hit button A to mark it. Then move the cursor to the upper-right corner of the desired area. Hit button A to reset the other corner, hit button B to flag the data inside the box and loop to set another box, or hit button C to flag the data and return to the menu, or hit button D to return to the menu with no further editing. C----------------------------------------------------------------------- FG AREA Move the cursor to the lower-left corner of the area you wish to flag (the box will follow the cursor). Once at the desired point, hit button A to mark it. Then move the cursor to the upper-right corner of the desired area. Hit button A to reset the other corner, hit button B to flag the data inside the box and loop to set another box, or hit button C to flag the data and return to the menu, or hit button D to return to the menu with no further editing. C----------------------------------------------------------------------- FLAG ABOVE Move the cursor to the Y-axis value above which you wish to flag and to the start time for the flagging; the horizontal line will follow. Hit button A to set the stop time for the flagging. Hit button B to flag all data above the line and and then loop to do it again. Hit button C to do the flagging, but then return to the menu, or hit button D to return to the menu with no additional flagging. C----------------------------------------------------------------------- FG ABOVE Move the cursor to the Y-axis value above which you wish to flag and to the start time for the flagging; the horizontal line will follow. Hit button A to set the stop time for the flagging. Hit button B to flag all data above the line and and then loop to do it again. Hit button C to do the flagging, but then return to the menu, or hit button D to return to the menu with no additional flagging. C----------------------------------------------------------------------- FLAG BELOW Move the cursor to the Y-axis value below which you wish to flag and to the start time for the flagging; the horizontal line will follow. Hit button A to set the stop time for the flagging. Hit button B to flag all data below the line and and then loop to do it again. Hit button C to do the flagging, but then return to the menu, or hit button D to return to the menu with no additional flagging. C----------------------------------------------------------------------- FG BELOW Move the cursor to the Y-axis value below which you wish to flag and to the start time for the flagging; the horizontal line will follow. Hit button A to set the stop time for the flagging. Hit button B to flag all data below the line and and then loop to do it again. Hit button C to do the flagging, but then return to the menu, or hit button D to return to the menu with no additional flagging. C----------------------------------------------------------------------- FLAG ABOUT MEAN This is an editing mode that is especially useful for point sources. Position the cursor at the beginning of the time interval over which you wish to determine the mean and RMS and hit button A, B, or C. Then position the cursor at the end of the time interval; a line indicating the interval will follow the cursor. Hit button A to reset the beginning time, button B or C to determine the mean and RMS and then flag appropriate data, or button D to exit with no additional flagging. Button B means to do another interval after the current one; button C means to return to the menu after the flagging. The mean and RMS of the data over the indicated time range will be printed on your terminal, and you will be asked to specify an RMS multiplier. Two lines will be drawn at factor*RMS above and below the mean value and a third at the mean value. You will then be asked if you wish to edit the data above and below these lines; answer Y or N. C----------------------------------------------------------------------- FG MEAN This is an editing mode that is especially useful for point sources. Position the cursor at the beginning of the time interval over which you wish to determine the mean and RMS and hit button A, B, or C. Then position the cursor at the end of the time interval; a line indicating the interval will follow the cursor. Hit button A to reset the beginning time, button B or C to determine the mean and RMS and then flag appropriate data, or button D to exit with no additional flagging. Button B means to do another interval after the current one; button C means to return to the menu after the flagging. The mean and RMS of the data over the indicated time range will be printed on your terminal, and you will be asked to specify an RMS multiplier. Two lines will be drawn at factor*RMS above and below the mean value and a third at the mean value. You will then be asked if you wish to edit the data above and below these lines; answer Y or N. C----------------------------------------------------------------------- FLAG INTERACTIV This editing mode allows the user to define a piecewise linear curve and then flag all data that lie either above or below the curve. First position the cursor at the point where you wish to start editing and hit button A or B. Then move the cursor to the right (only) to the next point on the curve and hit button A or B. A line will be drawn between the two points. Carry on in this way until you have defined your curve (using no more than 30 points). Then hit button C to edit the data and return to the menu. At any time in this process you may hit button D to abandon the the interactive clip and return to the menu. After you have hit button C, you will be asked if you wish to edit above or below the curve. Answer A or B, respectively, and watch the data disappear from the TV. C----------------------------------------------------------------------- FG INTER This editing mode allows the user to define a piecewise linear curve and then flag all data that lie either above or below the curve. First position the cursor at the point where you wish to start editing and hit button A or B. Then move the cursor to the right (only) to the next point on the curve and hit button A or B. A line will be drawn between the two points. Carry on in this way until you have defined your curve (using no more than 30 points). Then hit button C to edit the data and return to the menu. At any time in this process you may hit button D to abandon the the interactive clip and return to the menu. After you have hit button C, you will be asked if you wish to edit above or below the curve. Answer A or B, respectively, and watch the data disappear from the TV. C----------------------------------------------------------------------- FLAG ALL TIME This operation flags all times in the data. This is equivalent to a time range flagging from the beginning of the first frame to the end of the last frame, without having to load all the frames. No TV interaction is required. C----------------------------------------------------------------------- FG ALL T This operation flags all times in the data. This is equivalent to a time range flagging from the beginning of the first frame to the end of the last frame, without having to load all the frames. No TV interaction is required. C----------------------------------------------------------------------- LIST FLAGS This option allows you to list the flagging commands you have already prepared. You are prompted for a range of flag numbers to list. The selected flags are listed on your terminal. Each is labeled by a "flag" number which may be used to specify any flags that you may wish to undo. C----------------------------------------------------------------------- LST FLGS This option allows you to list the flagging commands you have already prepared. You are prompted for a range of flag numbers to list. The selected flags are listed on your terminal. Each is labeled by a "flag" number which may be used to specify any flags that you may wish to undo. C----------------------------------------------------------------------- UNDO FLAGS This option allows you to undo any one or more of the current flagging commands. You will be asked repetitively to enter the number of the flagging command to be excised (use LIST FLAGS to determine this). Enter 0 to terminate the list. The flag commands will be deleted from the FC table and the data reloaded on the display. C----------------------------------------------------------------------- UNDO FLG This option allows you to undo any one or more of the current flagging commands. You will be asked repetitively to enter the number of the flagging command to be excised (use LIST FLAGS to determine this). Enter 0 to terminate the list. The flag commands will be deleted from the FC table and the data reloaded on the display. C----------------------------------------------------------------------- SHOW AMPLITUDE This option specifies that (vector-averaged) fringe amplitudes are to be displayed on the TV and used in the editing. The screen is updated immediately, if needed. C----------------------------------------------------------------------- SHO AMP This option specifies that (vector-averaged) fringe amplitudes are to be displayed on the TV and used in the editing. The screen is updated immediately, if needed. C----------------------------------------------------------------------- SHOW PHASE This option specifies that (vector-averaged) fringe phases are to be displayed on the TV and used in the editing. The screen is updated immediately, if needed. C----------------------------------------------------------------------- SHO PHS This option specifies that (vector-averaged) fringe phases are to be displayed on the TV and used in the editing. The screen is updated immediately, if needed. C----------------------------------------------------------------------- SHOW DECORRELAT This option specifies that the ratios of the vector-averaged and scalar-averaged amplitudes are to be displayed on the TV and used in the editing. The screen is updated immediately, if needed. This option is meaningful only if IBLED has averaged the input data set over frequency channels, IFs, and/or time in making the master file. C----------------------------------------------------------------------- SHO DCR This option specifies that the ratios of the vector-averaged and scalar-averaged amplitudes are to be displayed on the TV and used in the editing. The screen is updated immediately, if needed. This option is meaningful only if IBLED has averaged the input data set over frequency channels, IFs, and/or time in making the master file. C----------------------------------------------------------------------- SELECT FRAME If the main editing window is too small to hold all the data for the current baseline, the data will be subdivided into possibly overlapping "frames". This option allows you to select an arbitrary frame by marking it with the cursor on the top plot which shows all of the data for the baseline and the current frame limits. Note that the top plot must be visible, before you can use this option. Move the cursor to the beginning time for the desired frame; the frame will be plotted and follow the cursor. Hit button A to switch between setting beginning and end times and hit button B or C to select the frame and immediately reload the data. Note that IBLED will adjust your selected frame to fit the editing window. Hit button D at any time to abandon frame selection. C----------------------------------------------------------------------- SLCT FRM If the main editing window is too small to hold all the data for the current baseline, the data will be subdivided into possibly overlapping "frames". This option allows you to select an arbitrary frame by marking it with the cursor on the top plot which shows all of the data for the baseline and the current frame limits. Note that the top plot must be visible, before you can use this option. Move the cursor to the beginning time for the desired frame; the frame will be plotted and follow the cursor. Hit button A to switch between setting beginning and end times and hit button B or C to select the frame and immediately reload the data. Note that IBLED will adjust your selected frame to fit the editing window. Hit button D at any time to abandon frame selection. C----------------------------------------------------------------------- FIRST FRAME If the main editing window is too small to hold all the data for the current baseline, the data will be subdivided into possibly overlapping "frames". All editing is limited to the data within the current frame. This option allows you to change the current frame to the one beginning at the start of the current data. The new frame will be immediately reloaded and the plot of the full data at the top will show the limits of the new frame. C----------------------------------------------------------------------- 1ST FRM If the main editing window is too small to hold all the data for the current baseline, the data will be subdivided into possibly overlapping "frames". All editing is limited to the data within the current frame. This option allows you to change the current frame to the one beginning at the start of the current data. The new frame will be immediately reloaded and the plot of the full data at the top will show the limits of the new frame. C----------------------------------------------------------------------- NEXT FRAME If the main editing window is too small to hold all the data for the current baseline, the data will be subdivided into possibly overlapping "frames". All editing is limited to the data within the current frame. This option allows you to change the current frame to the one beginning at the end of the current frame. The new frame will be immediately reloaded and the plot of the full data at the top will show the limits of the new frame. C----------------------------------------------------------------------- NEXT FRM If the main editing window is too small to hold all the data for the current baseline, the data will be subdivided into possibly overlapping "frames". All editing is limited to the data within the current frame. This option allows you to change the current frame to the one beginning at the end of the current frame. The new frame will be immediately reloaded and the plot of the full data at the top will show the limits of the new frame. C----------------------------------------------------------------------- PREVIOUS FRAME If the main editing window is too small to hold all the data for the current baseline, the data will be subdivided into possibly overlapping "frames". All editing is limited to the data within the current frame. This option allows you to change the current frame to the one ending at the start of the current frame. The new frame will be immediately reloaded and the plot of the full data at the top will show the limits of the new frame. C----------------------------------------------------------------------- PREV FRM If the main editing window is too small to hold all the data for the current baseline, the data will be subdivided into possibly overlapping "frames". All editing is limited to the data within the current frame. This option allows you to change the current frame to the one ending at the start of the current frame. The new frame will be immediately reloaded and the plot of the full data at the top will show the limits of the new frame. C----------------------------------------------------------------------- SELECT BASELINE This option allows you to specify the next baseline to be edited. You will have to type in the antenna numbers of the desired baseline on your terminal. The frame is reset to the beginning and the data displayed immediately. C----------------------------------------------------------------------- SEL BSLN This option allows you to specify the next baseline to be edited. You will have to type in the antenna numbers of the desired baseline on your terminal. The frame is reset to the beginning and the data displayed immediately. C----------------------------------------------------------------------- NEXT BASELINE This option selects the next baseline (in some rational order) to be loaded and edited. When the sequence is exhausted, IBLED returns to the beginning of the order. The frame is reset to the beginning and the data displayed immediately. C----------------------------------------------------------------------- NXT BSLN This option selects the next baseline (in some rational order) to be loaded and edited. When the sequence is exhausted, IBLED returns to the beginning of the order. The frame is reset to the beginning and the data displayed immediately. C----------------------------------------------------------------------- PREV BASELINE This option selects the previous baseline (in some rational order) to be loaded and edited. When the sequence is exhausted, IBLED returns to the end of the order. The frame is reset to the beginning and the data displayed immediately. C----------------------------------------------------------------------- PRV BSLN This option selects the previous baseline (in some rational order) to be loaded and edited. When the sequence is exhausted, IBLED returns to the end of the order. The frame is reset to the beginning and the data displayed immediately. C----------------------------------------------------------------------- LOAD This option will reload the screen. It is needed to force the display of newly selected Stokes or IFs or to put changed display ranges into effect. Occasionally it is also useful to reset the display to reflect the current state of editing. C----------------------------------------------------------------------- EXIT This option is used to exit the program. If you have done any flagging, you will be asked if you want to apply the flags to the input data set. If you answer N and the master file is cataloged (DOCAT > 0), then the program exits and and you may resume IBLED at a later time using the master file (IN2SEQ) with no loss of information. If you answer N and the master file is not cataloged, then you will be reminded of this and if you still answer N, then the master file is deleted and your flagging is discarded. If you answer Y - which you should do only when you are done with the current selection of data - then IBLED writes your flagging commands into an FG table for a multi-source file, or applies them directly to the data for a single-source file. The master file is then deleted without regard for DOCAT. C-----------------------------------------------------------------------