Dear Eric<br> Following is the result of running PRTAB with INEXT = SU on <br> a multi-format UV-data file containing a single source.<br> [In case the text appears jumbled on the mail-page, I have <br> also attached a text file that should be easy to view.]<br>
<br> UVPLT fails for all apparently valid combinations of the following <br> relevant parameters after it had been set to: <br><br>task 'UVPLT'<br>default UVPLT<br>getn 1 (relevant multi format file)<br>dotv 1<br>
<br>Now the following parameters are fiddled around with, and the result of <br>the UVPLT run is indicated in the success/failure column:<br>------------------------------------------------------------------------------------------------------------<br>
PAR Values tried sequentially Success/Failure<br>------------------------------------------------------------------------------------------------------------<br> 1) QUAL -1/1 Failed<br>
2) CALCODE ' ' Failed<br> 3) FREQID -1/1 Failed<br> 4) Sources '3C345' ' Failed<br>
Sources ' ' Succeeded<br>------------------------------------------------------------------------------------------------------------<br>It is true that the source's Flux density in the SU table are all 0. But the <br>
data being gain-calibrated at earlier stages of the processing, the flux <br>density scales in the "successful" UVPLT run (ie., with sources = ' ' ) <br>comes out correct. Only when the source-name is specified, there appears <br>
the problem -- " SOUFIL: ALL SOURCES REJECTED BY SELECTION CRITERIA"<br>Can some trailing SPACE-charatcers in the source-name cause this problem? <br><br>regards<br> --wasim<br><br>----------------------------------------------------------------------------------------------------------------------------------<br>
>go prtab<br> localhos PRTAB(31DEC10) 2234 26-JAN-2011 04:58:06 Page 1<br>3C34582 .UV . 1 Disk= 3 SU Table version 1<br>Title: AIPS SU<br>Created by FITLD on 26-JAN-2011 04:52:48<br>Last written by FITLD on 26-JAN-2011 04:52:48<br>
Ncol 19 Nrow 1 Sort cols:<br> Table has 4 keyword-value pairs:<br> NO_IF = 1<br> VELTYP = TOPOCENT<br> VELDEF = RADIO<br> FREQID = -1<br> Table can be written as a FITS ASCII table<br>
<br>COL. NO. 1 2 3 4 5 6 7 8 9 10 11<br> ROW ID. NO. SOURCE QUAL CALCODE IFLUX QFLUX UFLUX VFLUX FREQOFF BANDWIDTH RAEPO<br>
NUMBER JY JY JY JY HZ HZ DEGREES<br> 1 1 3c345 1 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000000E+00 6.510416E+04 2.507450E+02<br>
Type Q to stop, just hit RETURN to continue <br><br> localhos PRTAB(31DEC10) 2234 26-JAN-2011 04:58:10 Page 2<br>COL. NO. 12 13 14 15 16 17 18 19<br>
ROW DECEPO EPOCH RAAPP DECAPP LSRVEL RESTFREQ PMRA PMDEC<br> NUMBER DEGREES YEARS DEGREES DEGREES M/SEC HZ DEG/DAY DEG/DAY<br>
1 3.981027E+01 2.000000E+03 2.508244E+02 3.979371E+01 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00<br>AIPS 1: Resumes<br>><br>-------------------------------------------------------------------------------------------------------------------------------------<br>
<br><div class="gmail_quote">On Mon, Jan 24, 2011 at 9:46 PM, Eric Greisen <span dir="ltr"><<a href="mailto:egreisen@nrao.edu">egreisen@nrao.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div><div></div><div class="h5">Wasim Raja wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Dear Eric<br>
I would like to know if DBCON is the right task to combine 2<br>
uv-datasets observed with exactly the same settings (same<br>
Centre-freq, same BW, same nchan, same antenna config)<br>
but pointing towards 2 different sources.<br>
<br>
My goal is to use one of the sources to calibrate the other;<br>
unfortunately the data for the 2 sources are in 2 different FITS<br>
files. I would also like to add that the 2 sources were observed<br>
with their observation times interleaved, ie., every alternate<br>
scan corresponds to the same source (the successive scans<br>
were put in different FITS-files).<br>
<br>
I used DBCON to combine the 2 single source files (after having<br>
converted them to MULTI-source format using task MULTI) with<br>
options:<br>
DOARR = +1<br>
DOPOS = -1<br>
DBCON "appears to have ended successfully" creating the output<br>
multi source file. The SU table also seem to get the correct source<br>
names, except that their fluxes are all 0.<br>
<br>
But when I now use UVPLT to plot *one* of these sources I get the<br>
following error:<br>
localh> UVPLT1: Task UVPLT (release of 31DEC10) begins<br>
localh> UVPLT1: SOUFIL: ALL SOURCES REJECTED BY SELECTION CRITERIA<br>
localh> UVPLT1: Purports to die of UNNATURAL causes<br>
localh> UVPLT1: localhost 31DEC10 TST: Cpu= 0.0 Real= 0<br>
<br>
However, when I select ALL sources, UVPLT does make the plots<br>
successfully -- the 2 sources can also be clearly distinguished by<br>
their fluxes.<br>
<br>
<br>
Could you help please? What is the right task for combining uv data<br>
on 2 different sources observed with the same correlator settings and<br>
the same antenna configuration?<br>
<br>
</blockquote>
<br></div></div>
DBCON is precisely the correct programs for what you are attempting to do. We need to figure out what has not worked properly so that UVPLT source selection is not doing what you want. Note that the SU table is not supposed to have fluxes until they are entered via SETJY and/or GETJY. It is important to check the SU table and your UVPLT adverbs to see what the full name, QUAL, and CALCODE of each source might be. UVPLT has such adverbs and, for example, if the QUALs do not match your QUAL adverb value and your adverb value is not -1, then the sources will be rejected.<br>
<font color="#888888">
<br>
Eric Greisen<br>
<br>
</font></blockquote></div><br><br clear="all"><br>-- <br>Research Fellow (A&A)<br>Raman Research Institute<br>Bangalore--560080<br>