[daip] [!5837]: aips - Problems with Trec/opacity fit in APCAL

[Joseph L Richards]

Joseph L Richards updated #5837
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Problems with Trec/opacity fit in APCAL
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           Ticket ID: 5837
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/5837
           Full Name: Joseph L Richards
               Email: jlr at purdue.edu
             Creator: User
          Department: AIPS Data Processing
       Staff (Owner): -- Unassigned --
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template Group: Default
             Created: 03 December 2014 09:30 PM
             Updated: 03 December 2014 09:30 PM
                 Due: 05 December 2014 09:30 PM (2d 0h 0m)
      Resolution Due: 11 December 2014 09:30 PM (8d 0h 0m)



I am getting a strange result with APCAL when fitting Trec and opacity. For most stations, the fit in the output plot file looks good, but in one case (KP) there is an offset between the TSYS data points and the plotted curve.

These are 15 GHz data. Conditions were good and the TY tables were clean without major outliers except one obvious glitch on NL which I edited out (and this is not the affected station). I have tried all of the opcodes; GRID and GRDR give essentially the same results. OPAC, OPCR, and LESQ fail for MK complaining "0.00, unreasonable value. --This is probably due to bad data in TY table," which is strange because the TY tables look fine to me.

In the attached plots, KP is the problematic station. (PT also has something funny going on, actually.)

Do you have any suggestions?

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