USERID -32000.0 32000.0 File owner number - ignored INNAME Input UV file name (name) INCLASS Input UV file name (class) INSEQ 0.0 9999.0 Input UV file name (seq. #) INDISK Input UV file disk unit # SOURCES Sources to plot, ' '=>all. QUAL -10.0 Qualifier -1=>all CALCODE Calibrator code ' '=>all STOKES Stokes type to select. SELBAND Bandwidth to select (kHz) SELFREQ Frequency to select (MHz) FREQID Freq. ID to select. TIMERANG Time range to select ANTENNAS Antennas to plot BASELINE Baselines with ANTENNAS UVRANGE UV range in kilolambda. SUBARRAY 0.0 1000.0 Subarray, 0 => all BCHAN 0.0 4096.0 1st spectral channel # ECHAN 0.0 4096.0 Last spectral channel # NCHAV 0.0 4096.0 # of channels to average CHINC 0.0 4096.0 Increment in channel # BIF Low IF number to plot EIF Highest IF number to plot DOCALIB -1.0 101.0 > 0 calibrate data & weights > 99 do NOT calibrate weights GAINUSE CAL (CL or SN) table to apply DOPOL -1.0 10.0 If >0 correct polarization. PDVER PD table to apply (DOPOL>0) BLVER BL table to apply. FLAGVER Flag table version DOBAND -1.0 10.0 If >0 apply bandpass cal. Method used depends on value of DOBAND (see HELP file). BPVER Bandpass table version SMOOTH Smoothing function. See HELP SMOOTH for details. XINC 0.0 9999.0 Plot every XINC'th visibility 0 => 1. APARM Control parameters for UV 1: min of W range, klambda 2: max of W range, klambda 3: plot both halfs of UV(W)? 0 => plot both halfs -1 => plot one UV half +1 => plot another U,V half BPARM Control parameters 1 : X-axis type 0=>UV dist 2 : Y-axis type 0=>Ampl 1=> amplitude (Jy) 2=> phase (degrees) 3=> uv dist. (klambda) 4=> uv p.a. (deg N->E) 5=> time (IAT days) 6=> u (klambda) 7=> v (klambda) 8=> w (klambda) 9=> Re(Vis) (Jy) 10=> Im(Vis) (Jy) 11=> time (IAT hours) 12=> log10 (ampl) 13=> weight 14=> HA (hours) 15=> elevation (deg) 16=> parallactic angle 17=> uv dist. (klambda) along p.a. 18=> azimuth (deg) 19=> frequency 20=> channel 3 : > 0.0 => fixed scale < 0.0 => fixed range 4 : Xmin (fixed scale) 5 : Xmax (fixed scale) 6 : Ymin (fixed scale) 7 : Ymax (fixed scale) 8 : Number of bins in plot. <0 points and binned 9 : > 0 => list bin values. 10: > 0 => do not use array for plot files > 1 => do not use array for TV plots BPARM=6,7,2,0 generates square UV coverage plots DOACOR -1.0 1.0 > 0 include autocorrelations DOSCALE -1.0 3.0 > 0 => Scale vis by source flux; = 2 use spectral index = 3 include curvature DOWEIGHT -1.0 1.0 > 0 use weights in binning REFANT 0.0 90.0 > 0 => use REFANT for plot types 14, 15, 16, 18 ROTATE -360.0 360.0 uv p.a. for projection (deg N->E); type 17 only FACTOR -1000.0 1000.0 Scale dots by FACTOR < 0 => connect dots too DO3COL -1.0 1.0 > 0 use 3-color to separate channels and IFs; see explain LTYPE -410.0 410.0 Type of labeling: 1 border, 2 no ticks, 3 - 6 standard, 7 - 10 only tick labels <0 -> no date/time BADDISK Disk to avoid for scratch. DOTV -10.0 10.0 > 0 Do plot on the TV, else make a plot file GRCHAN 0.0 8.0 Graphics channel 0 => 1. XYRATIO 0.0 X/Y ratio 0 -> fit TV or 1 PL

UVPLT Type: Task Use: Plots data from a u,v data base making a plot file. Calibration information can be applied before plotting. If calibration information is to be applied, the data must be in TB sort order. The task now uses a new method of generating its plots - filling in an array in memory and then displaying the plot as an image. The labeling and the averaged bin values (if any) are plotted separately. For large data sets, this is very much faster than plotting individual samples to the TV and this generates substantially smaller plot files which may be displayed more rapidly. Note, however, that these plot files are images and so may not fit on your TV if plotted by TVPL. When making plot files, you may turn off this new method with BPARM(10). Adverbs: USERID.....Input file user number. Ignored INNAME.....Input UV file name (name) Standard defaults. INCLASS....Input UV file name (class) Standard defaults. INSEQ......Input UV file name (seq. #) 0 => highest. INDISK.....Disk drive # of input UV file. 0 => any. SOURCES....List of sources to be plotted. ' '=> all; if any starts with a '-' then all except ANY source named. QUAL.......Qualifier of source to be plotted. -1 => all. CALCODE....Calibrator code of sources to plot. ' '=> all. STOKES.....The desired Stokes type of the plotted data: 'I','Q','U','V', 'IV', 'IQU', 'IQUV' 'RR','LL', 'RL', 'LR', 'RRLL', 'RLLR', 'RLRL' 'XX','YY', 'XY', 'YX', 'XXYY', 'XYYX', 'XYXY' 'HALF', 'CROS', and 'FULL' have sensible interpretations depending on the Stokes present in the data. The last in each of the 3 rows above == 'FULL'. ' ' => 'FULL' All selected Stokes will be plotted SELBAND....Bandwidth of data to be selected. If more than one IF is present SELBAND is the width of the first IF required. Units = kHz. For data which contain multiple bandwidths or frequencies the task will insist that some form of selection be made by frequency or bandwidth. SELFREQ....Frequency of data to be selected. If more than one IF is present SELFREQ is the frequency of the first IF required. Units = MHz. FREQID.....Frequency identifier to select (you may determine which is applicable from the OPTYPE='SCAN' listing produced by LISTR). If either SELBAND or SELFREQ are set, their values overide that of FREQID. However, setting SELBAND and SELFREQ may result in an ambiguity. In that case, the task will request that you use FREQID. If all SELBAND, SELFREQ and FREQID are not specified (<= 0) then the task will loop over the frequency ID plotting all of them! TIMERANG...Time range of the data to be plotted. In order: Start day, hour, min. sec, end day, hour, min. sec. Days relative to reference date. ANTENNAS...A list of the antennas to plot. If any number is negative then all antennas listed are NOT desired and all others are. All 0 => list all. BASELINE...Baselines are specified using BASELINE. Eg. for baselines 1-6,1-8, 2-6 and 2-8 use ANTENNAS=1,2; BASELINE=6,8. UVRANGE....Range of projected spacings to be plotted in 1000's of wavelengths. 0 => 1, 1.E10 SUBARRAY...Subarray number to plot. 0 => all - the task will loop over subarray number. BCHAN......Beginning spectral line channel number. 0 => 1. ECHAN......Ending spectral line channel number. 0 => max. NCHAV......Number of spectral channels to average before plotting. 0 => 1. ECHAN will be adjusted downwards so that all averages will include the same number of spectral channels. CHINC......Increment in spectral line channel number. 0 => NCHAV Channels i through i+CHINC-1 are flagged if channel i is flagged. All channels may be flagged by setting DOALL. CHINC is ignored if NCHAV >= ECHAN-BCHAN+1. BIF........First IF number to plot. 0 => 1 EIF........Last IF number to plot. 0 => highest DOCALIB....If true (>0), calibrate the data using information in the specified Cal (CL) table for multi-source or SN table for single-source data. Also calibrate the weights unless DOCALIB > 99 (use this for old non-physical weights). GAINUSE....Version number of the Cal. table to apply to the data if DOCALIB=1. Refers to a CL table for multi-source data or an SN table for single-source. 0 => highest. DOPOL......If > 0 then correct data for instrumental polarization as represented in the AN or PD table. This correction is only useful if PCAL has been run or feed polarization parameters have been otherwise obtained. See HELP DOPOL for available correction modes: 1 is normal, 2 and 3 are for VLBI. 1-3 use a PD table if available; 6, 7, 8 are the same but use the AN (continuum solution) even if a PD table is present. PDVER......PD table to apply if PCAL was run with SPECTRAL true and 0 < DOPOL < 6. <= 0 => highest. BLVER......Version number of the baseline based calibration (BL) table to apply. <0 => apply no BL table, 0 => highest, if any. FLAGVER....Specifies the version of the flagging table to be applied. 0 => highest numbered table. <0 => no flagging to be applied. DOBAND.....(multi-source) If true (>0), then correct the data for the shape of the antenna bandpasses using the BP table specified by BPVER. The correction has five modes: (a) if DOBAND=1 all entries for an antenna in the table are averaged together before correcting the data. (b) if DOBAND=2 the entry nearest in time (including solution weights) is used to correct the data. (c) if DOBAND=3 the table entries are interpolated in time (using solution weights) and the data are then corrected. (d) if DOBAND=4 the entry nearest in time (ignoring solution weights) is used to correct the data. (e) if DOBAND=5 the table entries are interpolated in time (ignoring solution weights) and the data are then corrected. BPVER......(multi-source) specifies the version of the BP table to be applied. 0 => highest numbered table. SMOOTH.....Specifies the type of spectral smoothing to be applied to a uv database . The default is not to apply any smoothing. The elements of SMOOTH are as follows: SMOOTH(1) = type of smoothing to apply: 0 => no smoothing To smooth before applying bandpass calibration 1 => Hanning, 2 => Gaussian, 3 => Boxcar, 4 => Sinc To smooth after applying bandpass calibration 5 => Hanning, 6 => Gaussian, 7 => Boxcar, 8 => Sinc SMOOTH(2) = the "diameter" of the function, i.e. width between first nulls of Hanning triangle and sinc function, FWHM of Gaussian, width of Boxcar. Defaults (if < 0.1) are 4, 2, 2 and 3 channels for SMOOTH(1) = 1 - 4 and 5 - 8, resp. SMOOTH(3) = the diameter over which the convolving function has value - in channels. Defaults: 1,3,1,4 times SMOOTH(2) used when input SMOOTH(3) < net SMOOTH(2). XINC.......Plot every XINC'th visibility which might be plotted. This used to be a very useful option when the plots were written to the TV or plot file for each point. Now, when the plots are prepared in memory and then dumped to the device, it is far less useful. 0 => 1. APARM......Control parameters specifically for UV depending on W range This option can be usefull when investigating effect of the W term on the imaging. All baselines are converted to W>0 1: min W of W range to plot, in klambda 2: max W of W range to plot, in klambda 3: plot the mirrors UV(W)? 0 => plot both halfs of UV -1 => plot one half of U,V (for W>0) +1 => plot another half (mirror) of U,V (for W<0) BPARM......Control parameters: 1,2 = type of X-axis and type of Y-axis- where, 1 = amplitude (Jy), 2 = phase (degrees), 3 = u,v distance (klambda), 4 = u,v p.a.(deg, N thru E) 5 = time (IAT days), 6 = u (+max at left, bottom) 7 = v, 8 = w (all in klambda), 9 = real part (Jy) 10 = imaginary part (Jy) 11 = time (IAT hours) 12 = log10 (amplitude) 13 = vis weight 14 = hour angle (hours) 15 = elevation (degrees) 16 = parallactic angle (deg) 17 = uv dist. in p.a. ROTATE 18 = azimuth (deg) 19 = frequency 20 = spectral/IF channel ********************************************** Use -n to plot the parameter from max at left or bottom to min at right or top rather than the usual order (opposite for u). ********************************************** BPARM(1)=0 => 3 -- X-axis type is u,v, distance BPARM(2)=0 => 1 -- Y-axis type is Amplitude (Jy) For single-dish data: 1 and 9 are flux, 2 and 10 are offset, 3, 6, and 8 are longitude, 4 and 7 are latitude. 3 = if greater than zero, use BPARM(4) - BPARM(8) as the ranges of the axes. If less than zero, use the BPARMs to limit the range of the axes, but self-scale the axes within that range. If 0.0, fully self-scaling. Each axis treated separately. 4 = Minimum of X-axis - used if BPARM(5) > BPARM(4). 5 = Maximum of X-axis - used if BPARM(5) > BPARM(4). 6 = Minimum of Y-axis - used if BPARM(7) > BPARM(6). 7 = Maximum of Y-axis - used if BPARM(7) > BPARM(6). Note that phase is initially computed in the range -180 to 180 degrees, but will be plotted in the range 0 to 360 if specified as such. In self-scaled phase plots, the plot with the smaller total range of those two possibilities is used. Values > 360 or < -180 are not available. 8 = If = 0, plot each selected sample individually. If > 0, plot bin averages in X of the specified quantity. There will be BPARM(8) number of bins in the plot. For bins with more than 2 entries the vertical height of the symbol represents the standard deviation of the mean of the distribution in the bin except that the minimum height plotted = width of the + symbol. Self-scaling will be on binned values. If < 0, bin the data in abs(BPARM(8)) bins, but plot the individual samples (as line type 4) as well as the bin averages (as line type 3). Self-scaling will be on the individual samples. The binned values include individual samples outside the plot range (BPARM(6) - BPARM(7)) but are then plotted only if they fit in the plot range. 9 = If > 0, then the values and standard deviations in each bin will be put in the message file (prio=5). Has no effect if the plot is not binned. 10 If > 0, then the faster array method of plotting will not be used when making plot files. If > 1, then do not use the faster method of plotting for the TV either. Watching the plot develop can be instructive but can be literally 100's of times slower. BPARM=6,7,2,0 will generate a UV coverage plot with identical U and V limits. DOACOR.....If > 0, then the auto-corelations, if there are any, will also be plotted. DOSCALE....> 0 => Scale visibility amplitudes by source fluxes from source table; = 2 fit and use also spectral index; = 3 fit and use flux at 1 GHz, spectral index, and curvature. DOWEIGHT...> 0 => use data weights in averaging the binned data (BPARM(8) not zero). REFANT.....Hour angle, elevation, parallactic angle, and azimuth are actually antenna parameters not baseline parameters. If REFANT > 0, these plot parameters will be those evaluated at antenna REFANT. If REFANT = 0, these parameters are evaluated at each antenna of an antenna pair and averaged for plotting purposes. ROTATE.....Position angle, in degrees N thru E, for the projected uv distance. This parameter is only used if BPARM(1)=17 or BPARM(2)=17. FACTOR.....Multiplier to make plotted points larger or smaller. abs (FACTOR)< 0.1 => 1. FACTOR < 0 => connect the dots and draw the symbol. DO3COLOR...> 0 => use 3-color vectors in the plot symbols to allow the channels and IFs to be distinguished. BIF, BCHAN is full red, EIF,ECHAN is full blue. IF is the outer loop, so if there are 2 IFs, the channels and polarizations of IF 1 will range from red to green and those of IF2 will range from green to blue. Note that blue vectors may overlap and obscure red ones. LTYPE......Labelling type, see HELP LTYPE for details: 1 = border, 2 = no ticks, 3 or 7 = standard, 4 or 8 = relative to ref. pixel, 5 or 9 = relative to subimage (BLC, TRC) center, 6 or 10 = pixels. 7-10 all labels other than tick numbers and axis type are omitted. Less than 0 is the same except that the plot file version number and create time are omitted. Add n * 100 to alter the metric scaling. BADDISK....Disk numbers to avoid for scratch files. Scratch files may be created by the sorting routines if calibration or flagging is applied. DOTV.......> 0 => plot directly on the TV device, otherwise make a plot file for later display on one or more devices (including the TV if desired). GRCHAN.....Graphics channel (1 - 7) to use for line drawing. 0 => 1. XYRATIO....Scale the X axis longer than the Y by XYRATIO. If DOTV > 0, 0 -> fit to the TV window If DOTV <= 0, 0 -> 1.

UVPLT: Plots data from a u,v data base making a plot file. RELATED PROGRAMS: TKPL,PRTPL,TVPL PURPOSE UVPLT can be used to plot any pair of variables from a u,v data base i.e. any of u, v, w, uv distance, uv position angle, visibility amplitude, phase, real, imaginary. It is very useful as a diagnostic tool. Some possible uses : 1. Plotting visibility amplitude or phase as a function of uv distance to find a useful uv range for selfcalibration. Use the averaging option. 2. Plotting visibility amplitude or phase of the residuals of a set of clean components from a data base as a function of uv distance to find bad points which can be clipped using task CLIP. The task UVSUB can be used to subtract or add the visiblity corresponding to a set of clean components. For the purpose of spotting bad visibility points it is recommended that all clean components up to the first negative be subtracted before running UVPLT. 3. Plotting u against v will give the uv plane coverage of the data set. 4. Plotting visibility amplitude or phase as a function of uv distance to guesstimate a reasonable value for the zero spacing flux to be used in IMAGR. Values > 110-120 percent of the maximum correlated flux will lead to spurious results in cleaning. COMMENTS BCHAN, ECHAN, BIF, EIF: More than one frequency may be plotted from multi-channel, multi-IF data sets. The data will be plotted at u,v,w values corrected to the frequency of the individual channel and IF. This is useful in seeing the effect of bandwidth synthesis. DO3COLOR: DO3COLOR > 0 requests the plot to use colors to distinguish polarizations, spectral channels, and IFs. The actual logic is: COLOR = 0 DO IF = BIF,EIF DO CHAN = BCHAN,ECHAN BY CHINC DO POL = 1,Npol set and use COLOR COLOR = COLOR + DeltaColor END DO POL END DO CHAN END DO IF where COLOR=0 is pure red, DeltaColor is set so that the last value of COLOR is 1 which is pure blue. Thus, if there are 4 IFs, one spectral channel (average), and one polarization, the plot will be of red, yellow, cyan, and blue for IFs 1 through 4, resp. If there are 2 IFs and 2 polarizations (RR and LL say), then red is RR in IF 1, yellow is LL in IF 1, cyan is RR in IF 2, and blue is LL in IF 2. If a significant number of spectral channels are plotted, in one IF and one polarization, then there will be virtually a continuum of spectral colors from red at the lowest channels through green to blue at the highest with only a subtle change of color between channels. Note that the blue is plotted after the ble and so may overlap and obscure the red. UVRANGE : Allows selection of points to be plotted on the basis of distance from the centre of the uv plane. AVERAGING : A very nice option allows the averaging of the data into bins. The average and rms in a bin is plotted in place of the individual values. This is mainly useful for seeing the overall shape of the visibility curve. Default scaling is by the extrema of the axes. BPARM(8) switches on the averaging and sets the number of bins. The sign of BPARM(8) controls whether the data averaging uses the data weight (< 0) or is a simple average (> 0). SCALING : The default scaling is from the maximum to the minimum of an axis. The entire data base must be read to determine the scaling so you can halve the execution time of UVPLT by specifying the maximum and minimum values. If BPARM(3) > 0.0, then BPARM(4) - BPARM(7) control the scaling of the 2 axes. If, however, any of the BPARM4) - BPARM(7) is zero, then that parameter will be self-scaled. If you actually want 0.0 for a limit, set some small negative (for lower limits) or positive (for upper limits) amount.. The option of setting BPARM(3) < 0.0 is useful to restrict the data to some range, but still have a self-scaled plot. For example, BPARM = 3, 1, -1, 0, 0, 1.0, 10000 will plot amplitudes >= 1.0 against uv distance, but the amplitude scale will only go up to the peak amplitude in the data not to 10000 Jy. The X axis (uv distance) will self-scale to cover the full range. XINC : Allows plotting of only every XINC'th point. The plotting of the plot file can be extremely tiresome unless the number of points is limited. A few thousand is usually reasonable. REFERENCES None.