MODIFY BUG
Keywords: clic

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MODIFY BUG

            CLIC\MODIFY BUG number

        This  command  is  reserved for the correction of nasty bugs in the data
        acquisition.  The number is used for identification.

        Current accepted values:

          1 Affecting data taken between 11-nov-1995 and  09-jan-1996.   Bug  in
            RDI  found by S.Guilloteau. The continuum data was erroneously cali-
            brated in the real-time aquisition. As result,  the  continuum  data
            did  not  agree with the average of the spectral data.  For instance
            plotting data with "set sub C02 L02" as a  function  of  time  gives
            different  results for C02 and L02. The result would affect line in-
            tensities if, as is usually the case, the amplitude  calibration  is
            done with the continuum subbands.

            Correction:  the  current index should contain both atmosphere cali-
            brations and correlation data; the data file should be open for both
            input  and output.  This command should not affect data taken before
            11-nov-1995 and after 09-jan-1996; be careful for the last day since
            the hour is not checked, and RDI was corrected at 3pm.

          2  Affecting  data  taken  between 26-jan-2015 and 05-mar-2015. Bug in
            correl after change of commons to 7 antennas. Consequence is a phase
            offset  between narrow band correlator units and widex units depend-
            ing on elevation and baseline.

            MODIFY BUG 2 will correct the bug. Warning: this  correction  is  an
            offset to the phases, so it should be applied only once. If the cor-
            rection is done on data file (IPB), there is a check  that  this  is
            the  case, but header files (HPB) are not protected against correct-
            ing twice.

          3 Affects data reduced with a CLIC version compiled  from  15-jun-2023
            to 19-oct-2023, if HR spw are present and any MODIFY (ANTENNA, BASE,
            DELAY ...)  was done in lowres mode. In that case, CLIC stored  data
            modifiers only for the low-resolution spectral windows.

            MODIFY  BUG  3 will check the data modifier from both LR and HR, and
            if they do not match will apply the complement of LR to HR.