XTENSION= 'TABLE ' / ASCII table extension BITPIX = 8 / number of bits per data pixel NAXIS = 8 / number of data axes NAXIS1 = 102 / number of chars needed to describe members NAXIS2 = 4 / number of member HDUs in the group PCOUNT = 0 / required FITS extension keyword GCOUNT = 1 / required FITS extension keyword TFIELDS = 5 / Number of columns in the table EXTNAME = 'GROUPING' / This table describes a group EXTVER = 1 / Unique index of this grouping table in file GRPNAME = 'DEIMOS_Image_Group' / Is this really a good value to use here? DATE = 'dd/mm/yy' / Date of construction of grouping table CTIME = 'WkD CcYy Mon Dt Hr:Mn:Ss TZn' / Time of construction of table TBCOL1 = 1 / First character in column 1 TFORM1 = 'A8' / Fortran 77 format of column 1 TTYPE1 = 'MEMBER_XTENSION' / To find member HDUs by reference TBCOL2 = 9 / First character in column 2 TFORM2 = 'A24' / Fortran 77 format of column 2 TTYPE2 = 'MEMBER_NAME' / To find member HDUs by reference TBCOL3 = 33 / First character in column 3 TFORM3 = 'I3' / Fortran 77 format of column 3 TTYPE3 = 'MEMBER_VERSION' / To find member HDUs by reference TBCOL4 = 36 / First character in column 4 TFORM4 = 'A3' / Fortran 77 format of column 4 TTYPE4 = 'MEMBER_URI_TYPE' / To find member HDUs in other FITS files TBCOL5 = 39 / First character in column 5 TFORM5 = 'A64' / Fortran 77 format of column 5 TTYPE5 = 'MEMBER_LOCATION' / To find member HDUs in other FITS files ENDThe header is padded with ASCII blanks such that it consists of a positive integer multiple of 2880 bytes (36 card images of 80 characters).
The value of the keyword GRPNAME deserves further scrutiny.
Other kinds of FITS groups for DEIMOS data may become desirable; e.g.,
groups which relate calibration exposures to sky exposures. It may
also be desirable to insert other kinds of documentary data using
additional standard and/or DEIMOS-specific keywords. The DATE
keyword presents an obvious problem as we enter a new century, but
the FITS community has not yet developed an alternative scheme.
PRIMARY| | |URL|d0001_1.fits PRIMARY| | |URL|d0001_2.fits PRIMARY| | |URL|d0001_3.fits PRIMARY| | |URL|d0001_4.fits PRIMARY| | |URL|d0001_5.fits PRIMARY| | |URL|d0001_6.fits PRIMARY| | |URL|d0001_7.fits PRIMARY| | |URL|d0001_8.fitsNote that PHDU with the CCD image data may not contain
EXTNAME or EXTVER cards, so these fields are
blank.
When the image is grouped for archival storage and shipment everything will be stored within a single FITS file on disk. This table documents a situation where the image from each CCD is stored into a FITS IMAGE extension within the same file.
IMAGE |DEIMOS_Single_CCD | 1| | IMAGE |DEIMOS_Single_CCD | 2| | IMAGE |DEIMOS_Single_CCD | 3| | IMAGE |DEIMOS_Single_CCD | 4| | IMAGE |DEIMOS_Single_CCD | 5| | IMAGE |DEIMOS_Single_CCD | 6| | IMAGE |DEIMOS_Single_CCD | 7| | IMAGE |DEIMOS_Single_CCD | 8| |Note that all these tables reside in the same file as the grouping table, so the URI and location fields are blank.
The table is padded with ASCII blanks such that it consists of a positive integer multiple of 2880 bytes.
The EXTNAMEs for the DEIMOS tables
deserve further scrutiny. See the discussion in the
documents that define the tables.