Conforming Dataset Required Keywords

CONFORMS     Conforming Dataset Type. Some types require additional keywords
             to be present. Types include:

     TS             Time Series

     TS_BLOCKED     TS but blocked into multiple
                    Datasets, one dataset per interval.

     TS_EQ          TS_BLOCKED with equal intervals between
                    data records within each dataset.

     TS_EQ_TILE     Like TS_EQ but series number step is T_SNSTEP
                    rather than T_BLOCK as it is for TS_EQ and TS_BLOCKED.

     L_NU           2-D data containing solar oscillation
                    mode spectra.

     DOPCAL         Doppler calibration datasets.

     MISC           Miscellaneous Data.

PROTOCOL    File storage protocols for Record and Data sections of the
            Conforming Dataset.  The PROTOCOL value consists of two
            fields seperated with a ".".  The first field is the Record
            info file type and the second field is the Data storage
            protocol.  Recognized protocols include:

     RDB             Simple ascii tables conforming the the "/rdb" file spec.

     FITS            FITS files, one file per record per variable.

     FITS_MERGE      One FITS file per variable with the "record axis" being
                     the first, or slowest varying, index axis.

     CDF             CDF files.
            Most MDI image data in level-1 and level-1.5 are stored as
            RDB.FITS. Structure Program data and Spherical Harmonic data is
            RDB.FITS_MERGE.
            
Depending on the value of CONFORMS additional keywords may be required.  These
include:

     CONFORMS=TS
          T_EPOCH    Specifies reference epoch and type, UT or TAI.
          T_FIRST    Time of earliest data record.
          T_LAST     Time of latest data record.

     CONFORMS=TS_BLOCKED
          Same as TS but with additional keywords:
          T_BLOCK    Time interval of the dataset.
          T_START    Nominal start time of the Dataset.
          T_STOP     Nominal start time of the next dataset in the series.

     CONFORMS=TS_EQ
          Same as TS_BLOCKED but with additional keyword:
          T_STEP     Interval between data records.

     CONFORMS=TS_EQ_TILE
          Same as TS_EQ but with additional keyword:
          T_SNSTEP  Units of series number.

     CONFORMS=L_NU
          T_START    T_START from earliest contributing Dataset.
          T_STOP     T_STOP from latest contributing Dataset.
          M_TYPE     One of: "mavg", "zonal", "sector".
          FMIN       Frequency of first row of image (Hz).
          FMAX       Frequency of last row of image (Hz).  Computed from
                     FMIN, FDELTA, and image dimension.
          FDELTA     Delta frequency between rows.
          LMIN       Spherical harmonic degree l of first column in image.
          LMAX       Spherical harmonic degree l of last column im image.

     CONFORMS=DOPCAL
          DOPORDER  Max order of Doppler calibration data.
          CAL_DPC     Data product code for cal data