[daip] AIPS---fitld another warning message

[Eric Greisen]

童锋贤 wrote:

>  I have used MNJ on version 31DEC13 to update the code, but I meet a new 
> problem in "fitld", that say
> ,
> why the 'CL' table was deleted after 'fitld'? I need this 'CL' table.
>  Is that mean the 'CL' (created by fitld) is no significant at all? If 
> so, why we creat "CL" after 'fitld' fininshed reading?

FITLD deletes the CL and NX tables - both of which you will need - when it
encounters a condition that makes them incorrect.  Do not worry - task
INDXR can create them also.  But first we need to find out why this
condition occurred.  Task TIORD will examine the data set in your AIPS
area to see if it is completely in time order .  If it is not it can be
sorted with UVSRT or MSORT.

In VLBI, it is not uncommon for a "subarray" condition to arise.  By this we
mean that some antennas of your array were observing one source while others
were observing some other source.  This is a very serious complication.
 There
is a task called USUBA which will attempt to convert the data set into
one with
multiple subarrays so that INDXR can work correctly.  If this is the
usual VLBI
astrometry business, you will probably need to edit some of your
calibration tables so that the subarray column contains 0 (meaning all)
rather than 1, 2,2, or whatever.

First you need to find out why FITLD gave up on the CL/NX tables.

Eric Greisen