An additive table model. The filename to be used should be given immediately after atable in the model command. For example
XSPEC> 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 on the WWW or by anonymous ftp from legacy.gsfc.nasa.gov under caldb/docs/memos).