[daip] Problems with NX table in VLBI/VSOP data

[Andy Biggs]

Hi,

I downloaded some old VSOP data from the archive, but there are some 
problems to do with what was observed when. The FITLD messages claim 
that the source is changing rapidly and even includes the same scans 
more than once. Something similar is seen in the NX table and running 
INDXR does not fix the problem. The data themselves seem to be labelled 
correctly i.e. if I ask for a single source in VPLOT, it plots what I 
expect.

A sample of the FITLD output is given below. It starts off okay, but 
then goes wrong.

The data can be obtained from here:

ftp://ftp.eso.org/pub/general/abiggs/VLBA_VSN002826_file5.uvfits

I'd appreciate it if you'd take a look. The inputs to FITLD are very 
straightforward - just setting DATAIN should reveal the problem.

Thanks,

Andy

FITLD1: Task FITLD  (release of 31DEC18) begins
FITLD1: Correlator code version: 4.20
FITLD1: Data with weight <  0.70 will be permanently flagged
FITLD1: Create TST         .UVDATA.   1 (UV)  on disk  1  cno  161
FITLD1: SOINI: 'RAOBS' COLUMN NOT FOUND
FITLD1: SOINI: 'DECOBS' COLUMN NOT FOUND
FITLD1: Sky frequencies (MHz) before re-ordering occurs:
FITLD1: Incoming FREQID #   1
FITLD1:   1634.00    1650.00
FITLD1: Incoming FREQID #   2
FITLD1:   1655.99    1655.99
FITLD1: CTINI: 'TIME INT' COLUMN NOT FOUND
FITLD1: CTINI: 'TIME INT' COLUMN NOT FOUND
AIPS 1: Resumes
 >FITLD1: CL table interval set at  0.25 minutes
FITLD1:            !!!!!!!!!!!
FITLD1: Digital corrections being performed
FITLD1: Total power corrected even if no zero-padding
FITLD1:            !!!!!!!!!!!
FITLD1: Current file has    93118 visibilities
FITLD1: File ref. freq:     1634.00 MHz
FITLD1: Found J1041+06         at   0/21:00:09 src #   3
FITLD1:                                        fqid #   1
FITLD1: Found J1033+07         at   0/21:12:06 src #   1
FITLD1:    10000 vis. written
FITLD1:    20000 vis. written
FITLD1:    30000 vis. written
FITLD1:    40000 vis. written
FITLD1: Found J1033+07         at   0/22:11:02 src #   1
FITLD1:                                        fqid #   2
FITLD1: Found J1033+07         at   0/22:11:02 src #   1
FITLD1:    50000 vis. written
FITLD1:    60000 vis. written
FITLD1: Found J1058+01         at   0/22:28:09 src #   2
FITLD1: Found J1033+07         at   0/22:28:10 src #   1
FITLD1: Found J1058+01         at   0/22:28:09 src #   2
FITLD1: Found J1033+07         at   0/22:28:12 src #   1
FITLD1: Found J1058+01         at   0/22:28:09 src #   2
FITLD1: Found J1033+07         at   0/22:28:14 src #   1
FITLD1: Found J1058+01         at   0/22:28:13 src #   2
FITLD1: Found J1033+07         at   0/22:28:17 src #   1
FITLD1: Found J1058+01         at   0/22:28:13 src #   2
FITLD1: Found J1033+07         at   0/22:28:19 src #   1
FITLD1: Found J1058+01         at   0/22:28:18 src #   2
FITLD1: Found J1033+07         at   0/22:28:21 src #   1
FITLD1: Found J1058+01         at   0/22:28:18 src #   2
FITLD1: Found J1033+07         at   0/22:28:23 src #   1
FITLD1: Found J1058+01         at   0/22:28:22 src #   2
FITLD1: Found J1033+07         at   0/22:28:25 src #   1
FITLD1: Found J1058+01         at   0/22:28:22 src #   2
FITLD1: Found J1033+07         at   0/22:28:27 src #   1
FITLD1: Found J1058+01         at   0/22:28:26 src #   2
FITLD1: Found J1033+07         at   0/22:28:29 src #   1
FITLD1: Found J1058+01         at   0/22:28:26 src #   2
FITLD1: Found J1033+07         at   0/22:28:31 src #   1
FITLD1: Found J1058+01         at   0/22:28:30 src #   2
FITLD1: Found J1033+07         at   0/22:28:33 src #   1
FITLD1: Found J1058+01         at   0/22:28:30 src #   2
FITLD1: Found J1033+07         at   0/22:28:35 src #   1
FITLD1: Found J1058+01         at   0/22:28:34 src #   2
FITLD1: Found J1033+07         at   0/22:28:38 src #   1
FITLD1: Found J1058+01         at   0/22:28:34 src #   2

-- 

Andy Biggs
ARC Astronomer, ALMA Regional Centre
European Southern Observatory
Karl-Schwarzschild-Straße 2
D-85748 Garching
Germany

tel. +49 89 3200 6471
fax. +49 89 3200 6898