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Version 1.9 Build 803

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Proposed SD MS changes

        STATE table
        -----------
        o The information from SIG and REF is redundant; only one is 
                needed.
        o Add information on the procedure size (OBS\_MODE\_SIZE?).
                The sequence number information is obtained from SUB\_SCAN
        o CAL should be a Bool to indicate whether the cal was fired
                (True) or not (False). The cal temperature (TCAL) is in
                the SYSCAL table.

        MAIN/other tables
        -----------------
        o BEAM\_OFFSET is listed as a direction measure. Should be
                Float(2,num receptor) with units like arcminutes.
        o Add information (boolean) to MAIN or SYSCAL indicating whether
                data had been calibrated or not. This is an issue for
                single dish data where the CORRECTED\_DATA exists upon 
                filling and is altered only after calibration. 
        o Allow more cases with row-based measures. Currently, this is
                avoided (Note 229), however many measures columns (particularly
                in the SOURCE table) should allow this. Even in cases where
                a constant measure reference is required for efficiency,
                there needs to be some way to record what the original 
                reference was.
        o Split column keyword/unit information into a separate column. There
                are several cases where the column units or keywords should
                be able to change per row but not in the current definition.
                (e.g., units for CORRECTED\_DATA, frame information for 
                SYSVEL in SOURCE table).
        o The units for the CORRECTED_DATA column need to be optionally
                row-based.