[daip] SPCAL question and problem

[Hanno Spreeuw]

Hello,

I have a question about SPCAL and a small problem. How are the frequency 
dependent D-terms computed? Are the solutions expressed as coefficients 
of a polynomial?
LPCAL seems to export more numbers to the AN table than SPCAL does.

The problem:
If I run SPCAL it crashes:
"castor> SPCAL4: Interferometer Element  13
castor> SPCAL4:   R: Amp =  0.00403+/- 0.00050 Phase(deg) =  -89.35+/- 
  4.98
castor> SPCAL4:   L: Amp =  0.00855+/- 0.00059 Phase(deg) =   95.15+/- 
  2.82
castor> SPCAL4: Interferometer Element  14
castor> SPCAL4:   R: Amp =  0.00004+/- 0.00000 Phase(deg) =  127.40+/- 
  0.00
castor> SPCAL4:   L: Amp =  0.00776+/- 0.00059 Phase(deg) =  145.01+/- 
  3.10
castor> SPCAL4: True RMS residual =      5.16499338D-01
castor> SPCAL4: Pre-fit RMS =      9.43064733D-01
castor> SPCAL4: TABCOP ERROR   1 UPDATING AN TABLE
castor> SPCAL4: Purports to die of UNNATURAL causes"

I "solved" this by adding an extra identical AN table to the dataset. 
One is deleted, but the remaining one is updated by SPCAL.
Perhaps this issue has to do with the fact that this is WSRT data.

Thanks,
Hanno.