Updates to the manual

·                                Correction to the definition of dEM in the cemekl model description.

·                                Recorn is a multiplicative rather than mixing component after patch 12.5.1i.

·                                Clarified the exponent signs for the kdblur, kdblur2, and rdblur models.

·                                Typos fixed: pegpwrlw norm parameter is in micro-Jy, chain proposal filename in Appendix G is "randomize.dat".

·                                Description of pile-up added to the component types in the model command.

July 2009 (v12.5.1 release)

·                                Gain command has new source:spectrum syntax.  Gain parameters can now use newpar, freeze, thaw, untie, and error commands by prefixing the command name with the letter ‘r’.

·                                New Xspec.init numerical differentiation option mentioned in Overview and Spectral Fitting sections, and the fit and method commands.

·                                Improved the description of the critical delta and tolerance parameters in the fit, method, and error commands.

·                                Steppar now prompting for case of new minimum found, and can now operate on gain parameters.

·                                Setplot wave x-axis units option, set from Xspec.init file.

·                                Appendix F updated with new version string function.

·                                Added the delta option to the xset page.

·                                Added an example of a tclout error string.

·                                New udmget option for initpackage.

·                                New tclout sigma and tclout steppar delstat options.

·                                The goodness command now states that the default is nosim.

·                                Added par9 to kerrdisk and removed par4 from disk model.

·                                Moved previous release notes into new appendix I.

Feb 2009

·                                Additional section added to appendix F.

·                                New tclout gain option.

·                                Updates to nsmax and simpl model descriptions.

Nov 2008 (v12.5.0 release)

·                                New model files for cflux, diskir, kerrconv, kerrdisk, nsmax, nthcomp, partcov, recorn, simpl, swind1, spexpcut, and zxipcf.  Removed model files for rgsxsrc and bvapec (merged into bapec). 

·                                Added mdefine command to “Model Commands” section.

·                                Added new section “Tcl Scripts” to “XSPEC Commands”.

·                                Cleaned up and reorganized Appendix C “Adding models to XSPEC”

·                                Moved description of changes between v11 and v12 out of the introduction and into new Appendix H.

·                                Table added to xset command description for cross-referencing models with the variables they set in xset’s <string name> database. 

·                                Tclout command: goodness option added.

·                                Response command: added “{n}” syntax description.

·                                Model command description: fewer constraints in “Syntax Rules” and new use of unnamed models with active/inactive option.

·                                Chain command: run option has high-chatter output.

·                                In Appendix F, XSFunctions now has dependence on XSModel.

·                                In Appendix G, new function in RandomizerBase class.

·                                Slight modifications to descriptions in model files apec, c6mekl, compbb, equil, gnei, meka, mekal, nei, npshock, pshock, raymond, sedov, and zhighect, and command descriptions for addline, flux,  modid, and plot.