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XMM RGS

The data extension for an XMM RGS spectrum showing the use of vector AREASCAL. Note that COUNTS and AREASCAL are 8-byte DOUBLEs. This is more than required and software is not expected to retain the 8-byte precision.

XTENSION= 'BINTABLE'           / binary table extension
BITPIX  =                    8 / 8-bit bytes
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                   20 / width of table in bytes
NAXIS2  =                 3400 / number of rows in table
PCOUNT  =                    0 / size of special data area
GCOUNT  =                    1 / one data group (required keyword)
TFIELDS =                    4 / number of fields in each row
TTYPE1  = 'CHANNEL '           / label for field   1
TFORM1  = 'I       '           / data format of field: 2-byte INTEGER
TTYPE2  = 'QUALITY '           / label for field   4
TFORM2  = 'I       '           / data format of field: 2-byte INTEGER
TTYPE3  = 'COUNTS  '           / label for field   5
TFORM3  = '1D      '           / data format of field: 8-byte DOUBLE
TTYPE4  = 'AREASCAL'           / label for field   6
TFORM4  = '1D      '           / data format of field: 8-byte DOUBLE
EXTNAME = 'SPECTRUM'           / name of this binary table extension
HDUCLASS= 'OGIP    '
HDUCLAS1= 'SPECTRUM'
HDUCLAS2= 'TOTAL   '
HDUCLAS3= 'RATE    '
HDUVERS = '1.2.1   '
HDUVERS1= '1.2.1   '
DETCHANS=                 3400
CHANTYPE= 'PI      '
POISSERR=                    T
SYS_ERR =                    0 / no systematic error specified
GROUPING=                    0
BACKSCAL= 1.00000000000000E+00
CORRSCAL= 1.00000000000000E+00
BACKFILE= 'none    '
CORRFILE= 'none    '
ANCRFILE= 'none    '
FILTER  = 'none    '
TELESCOP= 'XMM     '           / XMM mission
INSTRUME= 'RGS1    '           / RGS Instrument
EXPOSURE= 3.28260546875000E+04 / total effective integration time
SOURCEID=                    1
RFLORDER=                    1
BETA_REF= 3.57852391898632E-02 / midpoint of bin at origin
BETA_WID= 1.20799995784182E-05 / uniform bin width
LINE_SEP= 1.54894550781250E+04 / grating line spacing (Angstroms)
ALPHANOM= 2.75247208774090E-02 / nominal incidence angle (radians)
RGS_DISP= 5.15623800456524E-02 / source dispersion angle (arcmin)
RGS_XDSP= -2.04170688986778E-01 / source cross-dispersion angle (arcmin)
TLMIN1  =                    0
TLMAX1  =                 3399
END



Keith Arnaud 2009-05-06