[daip] AIPS---fitld warning message

[Eric Greisen]

ͯ·æÏÍ wrote:
> 
> 
> Hello,
>   
> I'm a students of Chinese Academy of Science. I'm sorry for any 
> inconvenience if this email disturb you.
> 
> when I use 'fitld' to load a fits file(that fits  file was created by 
> me), I got a warning message that say "MC2CL: WARNING  8 CL RECORDS DID 
> NOT GET CLOCK AND ATMOSPHERE". What might be caused this warning?

We are here to help users of AIPS - please do not apologize for asking 
questions.

This is a bit curious - FITLD builds the initial calibration table (CL
version  1) from iinformation in the MC and IM tables.  This message 
says that there are times in the CL table  for which there was no MC 
table data within 1 minute.  You could try PRTAB on the CL table and 
examine the clock and atmosphere columns.  I suspect that normally they 
contain only zeros and, if so, this message contains nothing 
significant.  If they are not zero, then it might be good to find the 
relevant times and fix up the CL table manually.

Eric Greisen