[daip] possible problem with FRING ?
Miller Goss
mgoss at aoc.nrao.edu
Sun Dec 15 13:18:46 EST 2002
I can really imagine that the following is a USER error . If so my
apologies.
I run FRING on this single source data set with 128 channels.
AIPS 2: Image=W75N (UV) Filename=W75N .SP-67 . 1
AIPS 2: # visibilities 109486 Sort order TB
AIPS 2: --------------------------------------------------------------
AIPS 2: Type Pixels Coord value at Pixel Coord incr Rotat
AIPS 2: COMPLEX 1 1.000000E+00 1 1.0000E+00 0.00
AIPS 2: STOKES 4 RR 1 -1.0000 0.00
AIPS 2: FREQ 128 1.667240E+09 1 9.7656E+02 0.00
AIPS 2: IF 1 1.000000E+00 1 1.0000E+00 0.00
AIPS 2: RA 1 20 38 36.390 1 3600.000 0.00
AIPS 2: DEC 1 42 37 34.300 1 3600.000 0.00
AIPS 2: --------------------------------------------------------------
AIPS 2: Max ext file #: FQ 1 HI 1 AN 1 OB 1 WX 1
AIPS 2: Max ext file #: SN 1
>
I pick a fixed channel ( ch 69 ) and fring is quite happy .
: You are using a non-standard program
FRING2: Create W75N .FRING . 1 (UV) on disk 1 cno 113
FRING2: Selecting the data
AIPS 2: Resumes
>FRING2: VISDFT: Begin DFT component division
FRING2: VISDFT: Model components of type Point
FRING2: Model computation is 10 percent complete
FRING2: Model computation is 20 percent complete
FRING2: Model computation is 30 percent complete
FRING2: Model computation is 40 percent complete
FRING2: Model computation is 50 percent complete
FRING2: Model computation is 60 percent complete
FRING2: Model computation is 70 percent complete
FRING2: Model computation is 80 percent complete
FRING2: Model computation is 90 percent complete
FRING2: Model computation is 100 percent complete
FRING2: Field 1 used 0 CCs
FRING2: Determining solutions
FRING2: Writing SN table 1
FRING2: FIT DID NOT CONVERGE FOR IF 1
FRING2: This probably means that the starting value for the
FRING2: delay or rate for one or more antennae is bad. You
FRING2: may want to set search windows and try again.
FRING2: Found 3788 good solutions
FRING2: Failed on 14 solutions
FRING2: Adjusting soG2: Applying solutions to data
FRING2: ** WARNING - Subarray 1 contains VLBA data, but no CQ data
FRING2: ** to enable VLBA decorrelation corrections
FRING2: ** Type EXPLAIN FITLD for further information
FRING2: Previously flagged Flagged by gain Kept
FRING2: Partially 9 0 9
FRING2: Fully 0 0 109477
FRING2: Copied AN file from vol/cno/vers 1 91 1 to 1 113 1
FRING2: Copied OB file from vol/cno/vers 1 91 1 to 1 113 1
FRING2: Copied WX file from vol/cno/vers 1 91 1 to 1 113 1
FRING2: Appears to have ended successfully
FRING2: par
The sn table is there on the input multi source data base with
128 channels and looks ok . ie the phases and rates are ok .
The output uv single source is
AIPS 2: Image=W75N (UV) Filename=W75N .FRING . 1
AIPS 2: # visibilities 109486 Sort order TB
AIPS 2: --------------------------------------------------------------
AIPS 2: Type Pixels Coord value at Pixel Coord incr Rotat
AIPS 2: COMPLEX 1 1.000000E+00 1 1.0000E+00 0.00
AIPS 2: STOKES 4 RR 1 -1.0000 0.00
AIPS 2: FREQ 1 1.667240E+09 1 9.7656E+02 0.00
AIPS 2: IF 1 1.000000E+00 1 1.0000E+00 0.00
AIPS 2: RA 1 20 38 36.390 1 3600.000 0.00
AIPS 2: DEC 1 42 37 34.300 1 3600.000 0.00
AIPS 2: --------------------------------------------------------------
AIPS 2: Max ext file #: FQ 1 HI 1 AN 1 OB 1 WX 1
>
and has a single channel . I was not certain if this would produce
a single channel or 128 channels.
Then I try to uvplt this latter ( W75N.FRING.1 )
and get np
AIPS 2: UVPLT Plots data from a u,v data base: multi-channel version
AIPS 2: Adverbs Values Comments
AIPS 2: ----------------------------------------------------------------
AIPS 2: USERID 0 Data base owner number
AIPS 2: INNAME 'W75N ' Input UV file name (name)
AIPS 2: INCLASS 'FRING ' Input UV file name (class)
AIPS 2: INSEQ 1 Input UV file name (seq. #)
AIPS 2: INDISK 1 Input UV file disk unit #
AIPS 2: SOURCES 'W75N ' Sources to plot, ' '=>all.
AIPS 2: *rest ' '
AIPS 2: QUAL -1 Qualifier -1=>all
AIPS 2: CALCODE ' ' Calibrator code ' '=>all
AIPS 2: STOKES ' ' Stokes type to select.
AIPS 2: SELBAND -1 Bandwidth to select (kHz)
AIPS 2: SELFREQ -1 Frequency to select (MHz)
AIPS 2: FREQID -1 Freq. ID to select.
AIPS 2: TIMERANG *all 0 Time range to select
AIPS 2: ANTENNAS *all 0 Antennas to plot
AIPS 2: BASELINE *all 0 Baselines with ANTENNAS
AIPS 2: UVRANGE 0 0 UV range in kilolambda.
AIPS 2: SUBARRAY 0 Subarray, 0 => all
AIPS 2: BCHAN 0 1st spectral channel #
AIPS 2: ECHAN 0 Last spectral channel #
AIPS 2: ** press RETURN for more, enter Q or next line to quit print **
#stokes 'rr'
>go
UVPLT2: Task UVPLT (release of 31DEC02) begins
UVPLT2: XYSCAL: AXIS 2 DEGENERATE
UVPLT2: SCAL: XYSCL ERROR 1
UVPLT2: Purports to die of UNNATURAL causes
UVPLT2: parkes 31DEC02 TST: Cpu= 0.2 Real= 1
AIPS 2: Resumes
>stokes ''
>go
UVPLT2: Task UVPLT (release of 31DEC02) begins
UVPLT2: XYSCAL: AXIS 2 DEGENERATE
UVPLT2: SCAL: XYSCL ERROR 1
UVPLT2: Purports to die of UNNATURAL causes
UVPLT2: parkes 31DEC02 TST: Cpu= 0.2 Real= 0
AIPS 2: Resumes
>
This does not look good :
e = W75N .FRING . 1 Vol = 1 Userid = 321 Channels =
1 to 1
Source= W75N RA = 20 38 36.39 DEC = 42 37 34.3 IF = 1
Freq= 1.667239953 GHz Ncor= 4 No. vis= 109486 Sort order= TB
Weights have been multiplied by 1.0E-12
W75N 1.667239953 TB 1 RR 1 LL 1 RL 1
LR
Vis # IAT Ant Amp Phas Wt Amp Phas Wt Amp Phas Wt Amp
Phas Wt
1 0/18:46:21 3- 9******* 90 94******* 3 94******* 0 94*******
90 94
2 0/18:46:21 3- 7******* 90 94******* 3 94******* 0 94*******
90 94
3 0/18:46:21 1- 3******* 90 94******* 3 94******* 0 94*******
90 94
4 0/18:46:21 2- 3******* 90 94******* 3 94******* 0 94*******
90 94
5 0/18:46:21 3- 5******* 90 94******* 3 94******* 0 94*******
90 94
6 0/18:46:21 7- 9******* 90 94******* 3 94******* 0 94*******
90 94
7 0/18:46:21 1- 9******* 90 94******* 3 94******* 0 94*******
90 94
8 0/18:46:21 2- 9******* 90 94******* 3 94******* 0 94*******
90 94
9 0/18:46:21 5- 9******* 90 94******* 3 94******* 0 94*******
90 94
10 0/18:46:21 1- 7******* 90 94******* 3 94******* 0 94*******
90 94
11 0/18:46:21 2- 7******* 90 94******* 3 94******* 0 94*******
90 94
12 0/18:46:21 5- 7******* 90 94******* 3 94******* 0 94*******
90 94
13 0/18:46:21 1- 2******* 90 94******* 3 94******* 0 94*******
90 94
14 0/18:46:21 1- 5******* 90 94******* 3 94******* 0 94*******
90 94
15 0/18:46:21 2- 5******* 90 94******* 3 94******* 0 94*******
90 94
Type Q to stop, just hit RETURN to continue
When I then split the original data W75N67 with the sn
table and uvplt it and imagr it , the data is fine.
thanks
miller
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