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        CLIC\MODIFY DATA procedure [/BEFORE date] [/AFTER date] [/ATM]

    This  is  a general command to edit the data headers of the scans in the
    current index. CLIC enters a loop in which for all scans in the  current
    index,  the data header of the average record is read. For each scan the
    procedure 'procedure' (default extension ".clic") is executed. This pro-
    cedure  may  only  contain  the following commands : DUMP, HEADER, FLAG,
    MINMAX, GO, or any SIC command that acts on variables. Especially, vari-
    ables defined by the VARIABLE command can be modified...

    The  command GO [WRITE] must end the procedure.  With GO WRITE, the data
    record will be updated; with only GO, the data record is not updated and
    CLIC  loads the next record from the current index.  If no GO command in
    excountered in the procedure, the loop is aborted.  If a  PAUSE  command
    is found in the procedure, the PAUSE is executed, but the prompt changes
    to "MODIFY>".  The same commands as above may then be executed from  the
    keyboard; "QUIT ALL" may be used to abort the loop.

    The  options /BEFORE and /AFTER allows to select data depending on their
    observing dates.

    If present, the /ATM option allows to modify  the  data  header  of  the
    phase corrected average record (will work only if such record is present
    in the data, so only on cross-correlations:  CROSS,  FLUX,  POINT,  GAIN

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