; DFTPL ;--------------------------------------------------------------- ;! plots DFT of a UV data set at arbitrary point versus time ;# Task Plot UV ;----------------------------------------------------------------------- ;; Copyright (C) 1995, 2000, 2008-2009 ;; 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 ;----------------------------------------------------------------------- DFTPL LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC DFTPL Plots the DFT of an arbitrary point using UV data 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 0.0 9.0 Input UV file disk unit # UVRANGE 0.0 Range of projected spacings (thousands of wavelengths) TIMERANG Time range to select: Start Day, Hour, Min, Sec End Day, Hour, Min, Sec SHIFT Shift in asec at ref position FREQID 0.0 Frequency ID number: 0 -> 1 BCHAN 0.0 First channel to include ECHAN 0.0 Last channel to include BIF 0.0 First IF to include EIF 0.0 Last IF to include BPARM Control parameters 1 : Correlator number 2 : averaging interval (sec) 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 : X/Y axis ratio 9 : 1 plots points only 2 plots points and error bars 3 plots histogram (If <=0 then print time, flux, and error also.) 10 : scale factor for points DOCIRCLE -1.0 1.0 > 0 => extend ticks to form coordinate grid LTYPE -10.0 10.0 Type of labeling: 1 border, 2 no ticks, 3 - 6 standard, 7 - 10 only tick labels <0 -> no date/time DOTV -1.0 1.0 > 0 Do plot on the TV, else make a plot file GRCHAN 0.0 8.0 Graphics channel 0 => 1. ---------------------------------------------------------------- DFTPL Type: Task Use: Plots the DFT of the complex visibilities found in a UV data base for an arbitrary point in the sky as a function of time. Note that the visibilies are shifted under control of SHIFT and then the real parts are simply summed over all baselines in each time interval. Task TBAVG makes a UV data set of the summed visibilities instead of plotting them. NOTE: This task does NOT apply any flag or calibration tables. Run SPLIT or other appropriate task before running DFTPL. 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. CHANNEL....Spectral line channel number. 0 => 1. UVRANGE....Range (min, max) of projected baselines to include 0,0 => all baselines 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. 0 => full range. SHIFT......Shift in arcseconds - the data are shifted, summed, and then plotted. These are shifts in arc seconds at the reference point - RA = RA0 + SHIFT(1)/cos(DEC0), DEC = DEC0 + SHIFT(2) FREQID.....To select one frequency ID number: 0 => 1. BCHAN......Average channels BCHAN-ECHAN; 0 -> 1 ECHAN......Average channels BCHAN-ECHAN; 0 -> max BIF........Also average IFs BIF-EIF; 0 -> 1 EIF........Also average IFs BIF-EIF; 0 -> max BPARM......Control parameters: 1: 1 => plot RR data only 5 => plot Stokes I 2 => plot LL data only 6 => plot Stokes V 3 => plot RL data only 7 => plot Stokes Q 4 => plot LR data only 8 => plot Stokes U 2 = averaging interval in seconds (0 => 60) NOTE: an interval beginning at a sample time T1 will include all samples < T1+BPARM(2). If your data occur at 5 second intervals and you want no averaging, set BPARM(2) < 5. If you want to average pairs of samples, set 5 < BPARM(2) < 10. 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. 4 = Minimum of X-axis. Units = days. 5 = Maximum of X-axis (if = BPARM(4) do self-scale in X). 6 = Minimum of Y-axis. Units = Jy. 7 = Maximum of Y-axis (if = BPARM(6) do self-scale in Y). 8 = Ratio of X axis length to Y axis length. 9 = If 1, simply plot up the point -1, plot points and print out results (0 => -1) If 2, plot points and error bars -2, plot points, error bars, and print out results If 3, plot points in histogram form -3, plot histogram and print out results DOCIRCLE...False (<= 0) means that tick marks are short lines extending inward from the plot borders. True (>0) requests that a full coordinate grid be drawn. LTYPE......Labelling type: 1 = border, 2 = no ticks, 3 - 10 = standard, with 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. 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. ---------------------------------------------------------------- DFTPL: Plots DFT using data from a u,v data base. PROGRAMMER: T.Bastian, Univ. of Colorado RELATED PROGRAMS: TKPL,PRTPL,TVPL COMMENTS DFTPL was written primarily to assist stellar observers interested in time variable phenomena (e.g., outbursts on RS CVn's, dMe flare stars, etc.). Since these stars are in general unresolved, it's often pointless to make a synthesis map for each time interval. Instead one can do the following: 1) make a large field map using the entire XY sorted data base and identify all background sources; 2) run APCLN or MX with boxes around these sources (but not the stellar source of interest) and CLEAN them down to the noise; 3) using the resulting CLEAN components as a model of the background sources, use UVSUB to subtract the model from the UV data base; 4) use UVSRT to sort the data into TB order. If NO confusing sources of any importance can be found in the field, then of course steps 1-4 can be skipped and one simply begins with a TB sorted (calibated and edited) data base. he UV data base on an EXPORT tape is sorted in TB order, but one might have to use the verb PUTHEAD to indicate this fact in the header. This is done by first setting KEYWORD to 'SORT' and KEYSTRING to 'TB' and typing PUTH. The task DFTPL allows one to plot the direct fourier transform of the measured visibilities as a function of time for an arbitrary shift in RA and DEC. It will plot either points, points with error bars, or histogram format. The averaging interval is adjustable (BPARM(2)). The data time segment may be specified (through APARM). The task runs somewhat faster than UVPLT. Hence one can moniter all Stoke's parameters of a star with time VERY quickly, without having to resort to generating a tedious sucession of maps.