March 2010 (v12.6.0 release)
· Plot command has been updated with a description of new multi-panel capabilities.
· The setplot energy and wave options now take an additional argument for modifying plot units. This also affects the ignore/notice commands.
· New option “setplot redshift <z>” option.
· New models: ireflect (convolution) and sirf (additive).
· Power-law models (bkn2pow, bknpower, cutoffpl, and powerlaw) contain notices about new POW_EMIN and POW_EMAX options.
· Added an explanation of the POISERR vs. STAT_ERR column generation and probability distributions to the fakeit command page.
· New tclout nchan option.
· Data from Asplund et.al. added to the abund command table.
· Recorn model has a new paragraph explaining the use of the USE_NUMERICAL_DIFFERENTIATION setting. It has also been changed from a mixing to a multiplicative component.
· Appendix C contains new section about integrating 3rd party libraries with local model builds.
· Kdblur, kdblur2, and rdblur have had their par1 signs clarified and/or corrected.
· Updated the reference for Protassov et. al. in ftest.
· bexrav, bexriv, pexrav, pexriv and reflect have been updated, and the cflux model has additional comments.
· Added pileup type to the list of component types in the model command document.
· Typo fix in Appendix G: All occurrences of “randomizer.dat” should be “randomize.dat”.
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.