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atable: tabulated additive model

An additive table model component. The filename to be used must be given immediately after atable in the model command. For example: 

XSPEC12> model atable{mymod.mod}

uses mymod.mod as the input for the model. For specifications of the table model file, see the OGIP memo 92-009 on the FITS file format for table model files (available at https://heasarc.gsfc.nasa.gov/docs/heasarc/ofwg/docs/summary/ogip_92_009_summary.html. Example additive table model files are mekal.mod and raysmith.mod in $HEADAS/../spectral/modelData and testpo.mod in $HEADAS/../spectral/session.

Any number of tabulated model components (additive, multiplicative or exponential) may be used simultaneously.

The model value is assumed zero 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.