Pawel Magdziarz and Andrzej Zdziarski have supplied updated versions of their models that were included in the XSPEC v9 release. These models are nteea, the nonthermal pair plasma with angle-dependent reflection, pexrav, the exponentially cut-off power-law reflected from neutral material, pexriv , the exponentially cut-off power-law reflected from ionized material, and tita_a, the Comptonized spectrum with reflection.
The available tar file contains the source routines, documentation for the models, and the new entries for the model.dat file. The source routines should replace those in $XANADU/spectral/xspec/src/functions. $XANADU/spectral/xspec/src/model/model.dat should be edited and the entries for these models replaced by the new entries contained in this update. XSPEC should then be rebuilt in the standard fashion (instructions are available in the XANADU installation guide).