[daip] AIPS problems with tasks LPCAL and CCEDT

[Felix Poetzl]

Hello,

I am using the AIPS installation (31DEC20) at the MPIfR in Bonn and 
since last week I have a problem with the AIPS task LPCAL. It gives an 
error message when running it with "in2ver=2" and "ncomp = X 0" where X 
is any number of CC tables that were previously produced by CCEDT. In 
CCEDT, it does not matter if boxes are used or if automatic model 
splitting is enabled. The error message in LPCAL states:

VLB108> LPCAL1: vlb108 31DEC20 TST: Cpu=      0.0  Real=      0 
IO=         8
VLB108> LPCAL1: Task LPCAL  (release of 31DEC20) begins
VLB108> LPCAL1: Processing IF number    1
VLB108> LPCAL1: UVGET: doing no flagging this time
VLB108> LPCAL1: Sub-model   1:   1641+399     . ICLN   .   1 CCVER =   3
VLB108> LPCAL1: Using Clean Component source model
VLB108> LPCAL1: FACSET: 0.476291 Jy found from 160 components
VLB108> LPCAL1: VISDFT: Begin DFT component subtraction
VLB108> LPCAL1: VISDFT: fields 1 - 1 chns 1 - 1 in 1 CC models
VLB108> LPCAL1: VISDFT: Model components of type Point
VLB108> LPCAL1: QINIT: did a GET  of      5120 Kwords, OFF 17494967365643
VLB108> LPCAL1: TABIO: BAD LRNO=         125 LIMIT         124
VLB108> LPCAL1: TABCCM: TABIO ERROR  2
VLB108> LPCAL1: VISDFT: ERROR    2 READING CLEAN COMPS REC  126
VLB108> LPCAL1: Purports to die of UNNATURAL causes

After closer inspection, while having LPCAL run on each produced CC 
table separately, it seems to work on some, but not all of them. I could 
not really identify a pattern so far, but I think there might be a 
tendency for odd CC table numbers to not work.
When I looked at those tables using astropy, I noticed that the CC 
tables produced by CCEDT have an additional line in their header at the 
very bottom: ISORTORD=                -257
Deleting this line, exporting the file, and reading it again into AIPS 
does not do the trick, however, so I assume this is normal.

I tried this for 3 different datasets, so it has most likely nothing to 
do with my data.

Any help on this issue would be greatly appreciated.

Best regards,
Felix Pötzl

-- 
Felix Pötzl
Doctoral researcher in Astrophysics
IMPRS external student representative
Max-Planck-Institut für Radioastronomie
Auf dem Hügel 69, D-53121 Bonn
Office E2.05
Tel: +49228-525-366
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