; SNEDT ;--------------------------------------------------------------- ;! Interactive SN/CL/TY/SY table editor using the TV ;# TASK UV VLBI CALIBRATION EDITING TV-APPL INTERACTIVE OOP AP ;----------------------------------------------------------------------- ;; Copyright (C) 1995-1996, 1998-2000, 2003, 2006, 2010, 2012 ;; Copyright (C) 2014-2016 ;; 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 ;----------------------------------------------------------------------- SNEDT LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC SNEDT: Interactive SN/CL/TY/SY-table data editor using the TV INNAME Input UV data (name) INCLASS Input UV data (class) INSEQ Input UV data (seq. #) INDISK Input UV data disk drive # INEXT Input 'SN', 'CL', 'TY' table INVERS Input table file version no. DODELAY -1.0 2.0 > 0 => also edit delay/rate = 2 => edit MB delay only TIMERANG Time range to include BIF First IF to include EIF Last IF to include ANTENNAS 0.0 List of antennas to include FREQID -1.0 Frequency ID; 0 => 1 SUBARRAY 0.0 Subarray number 0 => 1. FLAGVER -1.0 > 0 FG version applied SOLINT 0.0 Times within SOLINT (min) are treated as equal. DETIME 0.0 Break interval (min) DOTWO -1.0 1.0 True => do second observable plot of main baseline EXPERT -1.0 1.0 > 0 start in expert mode CROWDED -1.0 1.0 > 0 => allow plots with all polarizations and IFs DO3COL -1.0 1.0 > 0 => do CROWDED with multiple colors =2 always ANTUSE 0.0 90.0 Initial displayed antennas BADDISK -1.0 1000.0 Disks to avoid for scratch. ---------------------------------------------------------------- SNEDT Type: Task Use: To edit calibration table data interactively. The chosen observable (gain amplitude, phase, delay, or rate from SN/CL taBles or Tsys from TY tables or Pgain or Pdif, Psum, and their ratio from SY tables) for an antenna is displayed as a function of time in an edit window on the TV. You may view the entire time range or select more detailed time ranges interactively. Optionally, under control of adverb DOTWO, a second SN/CL/TY/SY observable for the same antenna may be displayed over the same time range in a window above the edit window. Data in the primary observable for 0 to 10 other antennas may displayed over the same time range in windows above these on the TV screen. This display is controlled interactively. A menu-like control interface is available to select the data antenna and time range to be edited and to select various forms of editing. An "expert mode" allows you to enter single-letter menu selections from the keyboard (xterm) while this expert mode is enabled. ***** See EDITA to edit uv data based ******** ***** on SN/CL/TY/SY-table values ******** Adverbs: INNAME.....Input UV data file (name). Standard defaults. INCLASS....Input UV data file (class). Standard defaults. INSEQ......Input UV data file (seq. #). 0 => highest. INDISK.....Input UV data file disk drive #. 0 => any. INEXT......Table type: TY (system temperature), SY (EVLA SysPower), SN (gain solution), and CL (calibration) are supported. The task will use the TANT columns of a TY table if they are valid and will use the TSYS columns otherwise. FILLM writes the TANT columns with more-or-less calibrated antenna temperatures for data taken after May 1996. SY tables are provide with EVLA data - at least data read from the ASDM by obit (e.g. with BDF2AIPS). The CalDevice (CD) table is also used to provide the Tcals. Input file type: 'CL', 'TY', 'SY' or anything else => 'SN' INVERS.....Input file version number, 0 -> current highest. Output is always current highest + 1. DODELAY....> 0 AND <= 1.5 => use delays and rates as well as amplitudes and phases in the displays and editing process (for CL and SN) > 1.5 => use multi-band delays (only) in the displays and editing process (for CL and SN) <= 0 => do not display or edit upon delays and rates TIMERANG...Time range of the data to be edited. In order: Start day, hour, min. sec, end day, hour, min. sec. Days are relative to the reference date. BIF........The lowest numbered IF to include. 0 => 1. EIF........The highest numbered IF to include. 0 =>highest. Note: not all data sets will have IFs. ANTENNAS...A list of antenna numbers to include. 0 => all. FREQID.....Frequency ID to edit. 0 => 1, -1 => all. This is not recommended since you will not be able to tell them apart and they are likely to look different. SUBARRAY...Subarray number to edit. 0 => 1. FLAGVER....If > 0, apply FG table FLAGVER to the table data. Default here is to ignore any FG tables. SOLINT.....Samples within SOLINT (minutes) of the first sample in each time interval will be considered part of that interval, i.e., times with SOLINT of each other are treated as equal. 0 => 1/6000 (i.e. 0.01 sec) which is fine in most cases. DETIME.....Samples more than DETIME (minutes) from the previous will be considered to imply a break in the time sequence and will be assigned a time interval after a gap of intervals or 2 intervals if the sample is more than 2 * DETIME later. < SOLINT => max (2, 5 * SOLINT) minutes. DOTWO......> 0 (true) means to do the secondary plot of a second observable (amplitude, phase, rate, delay) from the primary antenna. <= 0 means to plot only the primary observable used for the editing. True is recommended. EXPERT.....> 0 => the task begins in "expert mode" in which commands are entered with single characters at the keyboard rather than by TV menu selection. You can switch in and out of expert mode interactively after the task begins without regard for the value of EXPERT. If the task begins in EXPERT mode, it starts with the amplitudes plotted from 0 to maximum, phases from -180 to 180, delays from -1000 to 1000 ns and rates from -1000 to 1000 mHz and with the ALL IF and ALL POL flags = .NOT.CROWDED rather than false. These choices may be changed interactively. CROWDED....If true (> 0), the task will be allowed to plot and edit all IFs and/or all polarizations at once. Otherwise, only one polarization and one IF are plotted at a time and much of the editing is based only on the values of that polarization/IF. DO3COL.....If CROWDED > 0 and DO3COL > 0, use 3 grey-scale image planes to plot the data in colors so as to differentiate between IFs and polarizations. When one IF and polarization is plotted, the graphics plane is used unless DO3COL > 1.5. ANTUSE.....Lists the antennas to appear in the initial display: antenna ANTUSE(1) is the initial edit antenna and ANTUSE(2) through ANTUSE(11) are the comparison antennas. The default is equivalent to ANTUSE=1,2,3 (or whatever are the 3 lowest numbered antennas). BADDISK....This array contains the numbers of disks on which it is desired that scratch files not be located. ------------------------------------------------------------------------ SNEDT is a TV graphic editor for SN, CL, TY, and SY tables. It works with the XAS-TV display graphics planes (6 of them) to allow you to flag and/or smooth the entries in an SN, CL, TY, or SY table. It does not change the input table; it makes a copy of the input and edits that. SNEDT does NOT take into consideration any relationship between the solution for one antenna at a given time and those for the other antennas at that time. Similarly, SNEDT ignores the relationships between delay, rate, and phase. If you do something to, say, phase, you should probably do the same thing to delay and rate (if appropriate) to avoid loss of coherence for cross-hand polarization data. All functions below may be applied either to the current IF or (sometimes) all IFs, to the current antenna or all antennas, and to the current polarization or both polarizations. It is up to you to chose which of these are appropriate and which are not. SNEDT attempts to read the entire table into dynamic memory when it starts up. If it cannot fit all the data, it attempts to read just one IF at a time. In that case, when you switch IFs, SNEDT has to write the previous IF back to disk as it reads in the next IF. This is both a bit slower and means that you cannot undo changes to one IF after switching to another IF. SNEDT will tell you as it starts whether "All data will reside in memory" or "Will do only one IF in memory at a time". The SWITCH ALL IF option will not appear in the latter case. There are 5 parts to SNEDT's display: (1) A menu of operations displayed in two columns, one each at the left and right sides of the screen. When the menu is displayed, move the cursor to the desired item and press buttons A, B, or C. To get on-line help in the message window about a given option, move the cursor to the desired menu item and press button D. (2) A plot at the bottom of the screen in a bright color (usually) of the data which may be actively edited at present. It is of the chosen type for the selected antenna, polarization(s), and IF(s) and is limited in time range by the current frame (which can be all or a portion of the total time range). Flagged data are shown in a different color. The time range of the frame may be made small to expand the time axis, but may also be made so large as to cause serious crowding of the plotted data points. (Increase your XAS window width to increase the plot scale.) (3) A plot above the edit area plot in the same bright color of the data from the selected antenna, polarization(s), and IF(s). This plot is in a second observable (e.g. if amplitude is in the edit plot, phase is often the second observable). For TY tables, there is only one observable, but "Tdif" is computed from the TY values and acts as a second observable. Tdif is Tsys/ - 1 where is the average of Tsys over a "scan" time surrounding the sample. Data in this second area may not be used for editing but should be helpful in choosing which data to delete in the edit area. Flagged data are shown in a different color. This plot may be suppressed by adverb DOTWO. (4) 0-10 plots of data of the current data type, polarization(s), and IF(s) for a list of 0-10 other antennas are shown above the second plot. They are shown for comparison using another color, while flagged data are shown in a different color. (5) Several text areas also appear including (a) the start and end times for the current frame's time axis, (b) the selected data type, IF, and polarization at the bottom of the screen, (c) the antenna shown in each plot at the top right of each plot, (d) the current smoothing function and all-IF, all-polarization, and all-antenna flags, (e) the y-axis tick values on each of the frame plots, and (f) while interactively setting time and/or value ranges, the time and/or value to which you are currently pointing. You may change the size of the XAS window at any time. SNEDT will not allow it to become too small, but will adjust its display for all reasonable sizes. For SN/CL tables, the left-hand menu can contain ------------------- | FLAG TIME | To delete one time at a time. | FLAG TIME RANGE | To delete one or more time ranges. | FLAG BELOW | To delete all displayed times with data below a cutoff value. | FLAG ABOVE | To delete all displayed times with data above a cutoff value. | FLAG AREA | To delete one or more areas in the data-value - time plane. | FLAG POINT | To delete one sample at a time using both horizontal and vertical cursor position. | FLAG QUICKLY | To delete samples using only mouse clicks | RESTORE TIME | To un-flag one time at a time. | RESTORE AREA | To un-flag one or more areas in the data-value - time plane. | SMOOTH TIME RNG | To apply the smoothing function to one or more time ranges | REREAD TIME RNG | To restore one or more time ranges from disk, undoing the current editing and smoothing. | ENTER SMOOTH PS | To select the type and parameters of the smoothing. | ENTER AMPL RNG | To select the display range for amplitude plots. Use 0 -1 for 0 to antenna maximum and 0 0 for min to max. | ENTER PHASE RNG | To select the display range for phase plots. | ENTER DELAY RNG | To select the display range for delay plots. | ENTER RATE RNG | To select the display range for rate plots. | USE EXPERT MODE | To control the task from the keyboard instead of the menu. | HOLD TV LOAD | To stop updating the TV display with every change of parameter; change several, then select | DO TV LOAD | To update the TV display now and with each change of display parameter. | REPLOT | To do the current plot over again | EXIT | To exit SNEDT, writing the data back to the output table. | ABORT | To exit SNEDT, deleting the output table. ------------------- For SN/CL tables, the right-hand menu can contain ------------------- | NEXT POL/IF | To switch to viewing the next correlator, switching to the other polarization and, if needed, incrementing the IF. | SWITCH POLARIZ | To switch to viewing and editing the other polarization (can cycle through all). | SWITCH ALL POL | To switch functions from applying to one polarization to applying to both polarizations or vice versa. | ENTER IF | To select which IF is viewed and edited. This can cause the current IF to be written to disk if all IFs did not fit in memory. 0 -> all. | SWITCH ALL IF | To switch functions from applying to one IF, to applying to a range of IFs, or to applying to all IFs (in sequence). | SWITCH ALL TIME | To switch FLAG ABOVE and FLAG BELOW between all times and the time range of the frame | SWITCH ALL SOURC| To switch between flagging the current source and flagging all sources. | SWITCH ALL ANT | To switch functions from applying to one antenna to applying to all antennas or vice versa. | ENTER ANTENNA | To select the antenna to be displayed at the top and in the edit area and to be edited. | ENTER OTHER ANT | To select up to 9 other antennas to be displayed; enter 9 numbers, 0's are then ignored. | NEXT ANTENNA | To select an antenna one higher than the currently selected antenna | PLOT ALL TIMES | To display and edit data for all times. | SELECT FRAME | To select a window into the current data interactively. | NEXT FRAME | To select the next time range window. | PREVIOUS FRAME | To select the previous time range window. | TV ZOOM | To alter the display zoom used while in the flag, restore, smooth and re-read functions. | OFF ZOOM | To turn off any zooming. | SHOW AMPLITUDE | To display and edit amplitudes. | SHOW PHASE | To display and edit phases. | SHOW DELAY | To display and edit delays. | SHOW RATE | To display and edit rates. | SHOW ALSO AMPL | To display amplitudes in the secondary window. | SHOW ALSO PHASE | To display phases in the secondary window. | SHOW ALSO DELAY | To display delayss in the secondary window. | SHOW ALSO RATE | To display rates in the secondary window. ------------------- For TY tables, the left-hand menu can contain ------------------- | FLAG TIME | To delete one time at a time. | FLAG TIME RANGE | To delete one or more time ranges. | FLAG BELOW | To delete all displayed times with data below a cutoff value. | FLAG ABOVE | To delete all displayed times with data above a cutoff value. | FLAG AREA | To delete one or more areas in the data-value - time plane. | FLAG POINT | To delete one sample at a time using both horizontal and vertical cursor position. | FLAG QUICKLY | To delete samples using only mouse clicks | RESTORE TIME | To un-flag one time at a time. | RESTORE AREA | To un-flag one or more areas in the data-value - time plane. | SMOOTH TIME RNG | To apply the smoothing function to one or more time ranges | REREAD TIME RNG | To restore one or more time ranges from disk, undoing the current editing and smoothing. | ENTER VALUES | To enter new values for Tsys from the terminal. | ENTER SMOOTH PS | To select the type and parameters of the smoothing. | ENTER TSYS RNG | To select the display range for Tsys plots. | ENTER TDIF RNG | To select the display range for Tdif plots. | SET SCAN LENGTH | To enter the length of a "scan" in seconds for computing Tdif = Tsys/ - 1. | USE EXPERT MODE | To control the task from the keyboard instead of the menu. | HOLD TV LOAD | To stop updating the TV display with every change of parameter; change several, then select | DO TV LOAD | To update the TV display now and with each change of display parameter. | REPLOT | To do the current plot over again (recomputes Tdif) | EXIT | To exit SNEDT, writing the data back to the output table. | ABORT | To exit SNEDT, deleting the output table. ------------------- For TY tables, the right-hand menu can contain ------------------- | NEXT POL.IF | To switch to viewing the next correlator, switching to the other polarization and, if needed, incrementing the IF. | SWITCH POLARIZ | To switch to viewing and editing the other polarization (can cycle through all). | SWITCH ALL POL | To switch functions from applying to one polarization to applying to both polarizations or vice versa. | ENTER IF | To select which IF is viewed and edited. This can cause the current IF to be written to disk if all IFs did not fit in memory. 0 -> all. | SWITCH ALL IF | To switch functions from applying to one IF to applying to all IFs or vice versa. | SWITCH ALL TIME | To switch FLAG ABOVE and FLAG BELOW between all times and the time range of the frame | SWITCH ALL SOURC| To switch between flagging the current source and flagging all sources. | SWITCH ALL ANT | To switch functions from applying to one antenna to applying to all antennas or vice versa. | ENTER ANTENNA | To select the antenna to be displayed at the top and in the edit area and to be edited. | ENTER OTHER ANT | To select up to 9 other antennas to be displayed; enter 9 numbers, 0's are then ignored. | NEXT ANTENNA | To select an antenna one higher than the currently selected antenna | PLOT ALL TIMES | To display and edit data for all times. | SELECT FRAME | To select a window into the current data interactively. | NEXT FRAME | To select the next time range window. | PREVIOUS FRAME | To select the previous time range window. | SHOW TSYS/-1 | To display and edit with Tdif. | SHOW TSYS | To display and edit Tsys. | TV ZOOM | To alter the display zoom used while in the flag, restore, smooth and re-read functions. | OFF ZOOM | To turn off any zooming. ------------------- For SY tables, the left-hand menu can contain ------------------- | FLAG TIME | To delete one time at a time. | FLAG TIME RANGE | To delete one or more time ranges. | FLAG BELOW | To delete all displayed times with data below a cutoff value. | FLAG ABOVE | To delete all displayed times with data above a cutoff value. | FLAG AREA | To delete one or more areas in the data-value - time plane. | FLAG POINT | To delete one sample at a time using both horizontal and vertical cursor position. | FLAG QUICKLY | To delete samples using only mouse clicks | RESTORE TIME | To un-flag one time at a time. | RESTORE AREA | To un-flag one or more areas in the data-value - time plane. | SMOOTH TIME RNG | To apply the smoothing function to one or more time ranges | REREAD TIME RNG | To restore one or more time ranges from disk, undoing the current editing and smoothing. | ENTER VALUES | To enter new values for Tsys from the terminal. | ENTER SMOOTH PS | To select the type and parameters of the smoothing. | ENTER PDIF RNG | To select the display range for Pdif (Pon-Poff) plots. | ENTER PSUM RNG | To select the display range for Psum (Pon+Poff) plots. | ENTER PGAIN RNG | To select the display range for PostGain plots. | ENTER TSYS RNG | To select the display range for power sum divided by Power difference / 2 * Tcal (= Tsys) plots. Use 0 -1 for 0 to antenna maximum and 0 0 for min to max. | ENTER PD/P RNG | To select the display range for plots of the difference between Pdif and its running average divided by the average. | ENTER PS/P RNG | To select the display range for plots of the difference between Psum and its running average divided by the average. | ENTER PG/P RNG | To select the display range for plots of the difference between Pgain and its running average divided by the average. | ENTER TS/T RNG | To select the display range for plots of the difference between Psum/Pdif/2*Tcal (= Tsys) and its running average divided by the average. | SET SCAN LENGTH | To enter the length of a "scan" in seconds for computing PD = Pdif/ - 1 and the ones for Psum and PSum/Pdif/2*Tcal. | USE EXPERT MODE | To control the task from the keyboard instead of the menu. | HOLD TV LOAD | To stop updating the TV display with every change of parameter; change several, then select | DO TV LOAD | To update the TV display now and with each change of display parameter. | REPLOT | To do the current plot over again (recomputes Tdif) | EXIT | To exit SNEDT, writing the data back to the output table. | ABORT | To exit SNEDT, deleting the output table. ------------------- For SY tables, the right-hand menu can contain ------------------- | NEXT POL/IF | To switch to viewing the next correlator, switching to the other polarization and, if needed, incrementing the IF. | SWITCH POLARIZ | To switch to viewing and editing the other polarization (can cycle through all). | SWITCH ALL POL | To switch functions from applying to one polarization to applying to both polarizations or vice versa. | ENTER IF | To select which IF is viewed and edited. This can cause the current IF to be written to disk if all IFs did not fit in memory. 0 -> all. | SWITCH ALL IF | To switch functions from applying to one IF to applying to all IFs or vice versa. | SWITCH ALL TIME | To switch FLAG ABOVE and FLAG BELOW between all times and the time range of the frame | SWITCH ALL SOURC| To switch between flagging the current source and flagging all sources. | SWITCH ALL ANT | To switch functions from applying to one antenna to applying to all antennas or vice versa. | ENTER ANTENNA | To select the antenna to be displayed at the top and in the edit area and to be edited. | ENTER OTHER ANT | To select up to 9 other antennas to be displayed; enter 9 numbers, 0's are then ignored. | NEXT ANTENNA | To select an antenna one higher than the currently selected antenna | PLOT ALL TIMES | To display and edit data for all times. | SELECT FRAME | To select a window into the current data interactively. | NEXT FRAME | To select the next time range window. | PREVIOUS FRAME | To select the previous time range window. | SHOW PDIF | To display and edit power differences (Pon-Poff) | SHOW PSUM | To display and edit power sums (Pon+Poff) | SHOW PGAIN | To display and edit power post gains (Pgain) | SHOW TSYS | To display and edit Psum/Pdif/2*Tcal = Tsys | SHOW PDIF/

-1 | To display and edit the differences between power difference and its running mean | SHOW PSUM/

-1 | To display and edit the differences between power sum and its running mean | SHOW PGAIN/

-1 | To display and edit the differences between Pgain and its running mean | SHOW TSYS/-1 | To display and edit the differences between Psum/Pdif/2*Tcal = Tsys and its running mean | SHOW ALSO PDIF | To display power differences (Pon-Poff) in the secondary window. | SHOW ALSO PSUM | To display power sums (Pon+Poff) in the secondary window. | SHOW ALSO PGAIN | To display power post gains in the secondary window. | SHOW ALSO TSYS | To display Psum/Pdif/2*Tcal = Tsys in the secondary window. | SHOW ALSO DPDIF | To display the difference between the power difference and its running mean in the secondary window. | SHOW ALSO DPSUM | To display the difference between the power sum and its running mean in the secondary window. | SHOW ALSO DPGAIN | To display the difference between the power post gain and its running mean in the secondary window. | SHOW ALSO DTSYS | To display the difference between Psum/Pdif/2 * Tcal = Tsys and its running mean in the secondary window. | TV ZOOM | To alter the display zoom used while in the flag, restore, smooth and re-read functions. | OFF ZOOM | To turn off any zooming. ------------------- The menus will not show all of these options every time. The HOLD TV LOAD option is shown until invoked, and then is replaced with the DO TV LOAD. When that is invoked, the HOLD TV LOAD option reappears. The DELAY and RATE options appear only if the DODELAY adverb was true. The SWITCH POLARIZ and SWITCH ALL POL options appear only if there are two polarizations in the SN/CL/TY/SY table. The ENTER IF option appears only if there is more than one IF in the table and the SWITCH ALL IF option appears only if there is more than one IF and all IFs fit in the program memory. The only SHOW and SHOW ALSO options to appear are for those not already displayed. The smoothing functions are based on two windows on the time axis. The cursor is used to set a time-range (t1-t2) to be smoothed. Data from t1-W to t2+W, where W is the smoothing function window, are passed into a smoothing routine and the results used to replace the samples in the t1 through t2 range. The functions are: (1) 2PT Replace datum at time t, if flagged, with the linearly interpolated value of the nearest sample above t and below t but within W/2 of t. (2) 2PTH Replace datum at time t with the average of the datum itself and the linearly interpolated value of the nearest sample above t and below t, but within W/2 of t. (3) BOX Replace datum at time t with the average of all data within W/2 of t. (4) MWF Replace datum at time t with the median of all data within W/2 of t. (5) GAUS Replace datum at time t with the weighted average of all data samples within W/2 of t, using a Gaussian function of abs(time-t) of FWHM of W2. (6) EXO Replace datum at time t with the weighted average of all data samples within W/2 of t, using a Exponential function of abs(time-t) of FWHM of W2. (7) LINE Replace datum at time t with the weighted average of all data samples within W/2 of t, using a linear function of abs(time-t) of FWHM of W2. The ENTER SMOOTH PS asks you 2 or 3 questions: the first to set the type which is case-insensitive but must be left justified, the second to set W in integer seconds, and the third, if needed, to set the full-width at half maximum for the Gaussian and linear weighting functions. The smoothing is done across all sources. For TY tables it is done on the Tsys. For SY tables it is done simultaneously on the Pdif, Psum, and Pgain. The ratio of Psum/Pdif/2*Tcal is recomputed as well. This allows the flagging to be handled correctly. For SN/CL tables, the smoothing is done only on the currently displayed parameter. It has the undesirable attribute that the flagging of the other parameters is lost even though they are not smoothed. Unfortunately, one probably wants to smooth amplitude and phase solutions rather differently making this a feature rather than a correctable bug. Note that value-dependent flagging (FLAG BELOW, ABOVE, AREA) use the values currently plotted to decide what to delete. You need also to be careful with the SWITCH ALL ANT setting with these value-dependent commands. If one antenna is set, then the commands only apply to the current antenna. If all antennas is set, the commands apply to all antennas. The first two set a clip level, below or above which data are deleted, based on the value of the observable in each antenna independently. The FLAG AREA command, however, only looks at the values of the observable in the main edit antenna and flags those samples from all applicable antennas Be careful when choosing EXIT versus ABORT. The former leaves the new and modified SN or CL table attached to the input uv data, the latter causes the new and modified table to disappear without a trace. After EXIT, of course, one may use, edit, or ignore the output SN or CL table. The colors used by SNEDT are those of the various graphics planes when it begins to run. You may change them with the AIPS verb GWRITE to more desirable colors. The planes are: Plane Default RGB Use 1 1.00 1.00 0.00 Main editing and secondary windows 2 0.06 1.00 0.00 Comparison antenna data windows 3 1.00 0.67 1.00 Menu highlight 4 0.00 1.00 1.00 Edit and frame window boundaries 5 1.00 0.18 0.18 Flagged data in all windows 6 0.60 0.60 1.00 Menu foreground 7 1.00 0.80 0.40 unused You may wish to change the colors to ones that you can see better. When CROWDED and DO3COL are invoked together, TV channels 14-16 are used for a 3-color display to help you see which IF/polarization is which. The colors range from red to blue starting with IF BIF, polarization 1, then polarization 2, then IF 2 polarization 1, and so on. When you select a single IF and polarization, graphics plane 1 is used unless you set DO3COL > 1.5. In that case each correlation is plotted in its unique color whether in a single display or a crowded one. When displaying one IF and two polarizations, the colors are chosen so that polarization 1 appears in a red/orange color and polarization 2 in a green/blue color. In "expert" mode, you are prompted with a set of 4-character codes. You type in the letter within that code that is shown in upper case (left-justified with a carriage return) to get the desired function. The expert functions allowed for SN/CL tables are Code Prompt Full menu OP name T Time FLAG TIME R Rang FLAG TIME RANGE B Belo FLAG BELOW A Abov FLAG ABOVE E arEa FLAG AREA O pOin FLAG POINT Q Quik FLAG QUICKLY C nCor NEXT POL/IF N Nant NEXT ANTENNA F Fram SELECT FRAME M aMpl SHOW AMPLITUDE P Phas SHOW PHASE D Dely SHOW DELAY S Srat SHOW RATE X eXit EXIT EXPERT MODE H Help THIS HELP LIST For TY tables they are Code Prompt Full menu OP name T Time FLAG TIME R Rang FLAG TIME RANGE B Belo FLAG BELOW A Abov FLAG ABOVE E arEa FLAG AREA O pOin FLAG POINT Q Quik FLAG QUICKLY C nCor NEXT POL/IF N Nant NEXT ANTENNA F Fram SELECT FRAME S tSys SHOW TSYS D tDif SHOW TDIF X eXit EXIT EXPERT MODE H Help THIS HELP LIST For SY tables they are Code Prompt Full menu OP name T Time FLAG TIME R Rang FLAG TIME RANGE B Belo FLAG BELOW A Abov FLAG ABOVE E arEa FLAG AREA O pOin FLAG POINT Q Quik FLAG QUICKLY C nCor NEXT POL/IF N Nant NEXT ANTENNA F Fram SELECT FRAME S pSum SHOW PSUM D pDif SHOW PDIF G pGai SHOW PGAIN Y tsYs SHOW TSYS X eXit EXIT EXPERT MODE H Help THIS HELP LIST although some may be suppressed depending on what is currently displayed. ------------------------------------------------------------------------