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etable: exponential tabular model

An exponential table model. The filename to be used should be given immediately after etable in the model command. For example:

XSPEC12> model etable{mymod.mod}

uses mymod.mod as the input for the model. XSPEC will multiply the contents of the model by -1 then take the exponential i.e. this model is for calculating absorption functions. For specifications of the table model file, see the OGIP memo 92-009 on the FITS file format for table model files (available on the WWW or by anonymous ftp from ftp://legacy.gsfc.nasa.gov/caldb/docs/memos).

The model value is assumed unity outside the tabulated energies unless the keywords LOELIMIT and HIELIMIT are given in the primary extension of the FITS file. In the latter case the value given in LOELIMIT will be used for energies below those tabulated and HIELIMIT for energies above those tabulated.