Trapping a crash when plotting and a new tclout option

12.7.0t	Fix for a crash which may occur when attempting to plot data for a spectrum which contains no noticed channels. Our thanks to Eduardo Ojero Pascual for pointing this out. Report added on Jan 03, 2012.
12.7.0u	This adds a new tclout option, tclout rerror, which is necessary for retrieving the results of an rerror command run on gain parameters. The syntax for this is: tclout rerror [< source number>:]< gain par number> Our thanks to Matteo Guainazzi for bringing this to our attention. Report added on Jan 18, 2012.

A couple of patches to relatively obscure xspec bugs

12.7.0r	When using C-stat, if spectra with no backgrounds and different exposures and/or areascales are collected into the same data group, the renorming operation will miscalculate and can disrupt the fit. Our thanks to Jeremy Sanders for pointing this out. Report added on Dec 06, 2011.
12.7.0s	Fix for bug which caused errors in the apec model when running v1.x of AtomDB and the wilm abundance option. Report added on Dec 08, 2011.

xspec patches 12.7.0p and q

12.7.0p

Fix for the obscure case of a model containing both 1) frozen norm parameters AND 2) an unfrozen norm for an additive component to the left of a multiplicative component. When these conditions exist the renorm operation may break, causing a fit to go astray. Our thanks to Hauke Worpel for pointing this out. Report added on Oct 28, 2011.

12.7.0q

Enhancements for PyXspec. This adds the object attribute Model.expression which stores the model expression string. It also adds AllModels.sources to the global AllModels container. This is a dictionary object containing the current source numbers with their assigned active models. Its key:value pairs are: [source number]:[model name]. Our thanks to Adam Mantz for these suggestions. Report added on Oct 28, 2011.

xspec patches 12.7.0l-o

12.7.0l	A crash can occur when trying to plot data while using a dummy response with no channel array. Our thanks to Randall Smith for pointing this out. Report added on Oct 05, 2011.
12.7.0m	An enhancement for PyXspec. This adds the new function AllModels.simpars(), which provides the same functionality as standard XSPEC's tclout simpars command. The simulated parameter values are returned as a tuple of floats. Our thanks to Martin Sparre for this suggestion. Report added on Oct 05, 2011.
12.7.0n	A fix for PyXspec. When a Parameter object's frozen attribute is toggled (to either freeze or thaw the parameter), the fit statistic's degrees-of-freedom doesn't get updated until a new fit is performed. It ought to be updated immediately. Our thanks to Sebastien Guillot for pointing this out. Report added on Oct 05, 2011.
12.7.0o	An enhancement for PyXspec. This adds the new attribute Fit.covariance, which holds (in a tuple) the covariance matrix values from the most recent fit. Our thanks to Sebastien Guillot for this suggestion. Report added on Oct 11, 2011.

xspec patches 12.7.0i,j,k

12.7.0i	This fixes an obscure case where erroneous usage of "?" for command summary display is causing a crash. Our thanks to Sebastien Guillot for pointing this out. Report added on Sep 07, 2011.
12.7.0j	Fix needed to allow gain fit parameters to be used along with custom energy arrays supplied by the energies command. (This includes the energies extend option.) Our thanks to Dominic Walton for pointing this out. Report added on Sep 07, 2011.
12.7.0k	For PyXspec only. This improves the output of the Model.folded() class method for the case where there are ignored channels. Previously, bins in the folded model array were set to zero when they corresponded to ignored channels. Now they are removed from the array altogether. This ensures that the length of the folded model array always matches the number of noticed channels. Our thanks to Nakisa Nooraee for pointing this out. Report added on Sep 08, 2011.

Two PyXspec patches

12.7.0g	Minor fix for when retrieving plot arrays (using tclout plot in standard XSPEC, or Plot.x() and Plot.y() in PyXspec). This removes the trailing zeros that padded the arrays when plot points were removed with the ignore or setplot rebin commands. Our thanks to Alexander Gewering-Peine for pointing this out. Report added on Aug 12, 2011.
12.7.0h	Fix for PyXspec only. Earlier patch 12.7.0f introduced a bug which occurs when a non-norm parameter is modified and set to a parameter link. In this case it does not perform the necessary automatic model recalculation. Our thanks to Adam Mantz for pointing this out. Report added on Aug 25, 2011.

A model for fitting power spectra in xspec

A model from Adam Ingram and Chris Done for the power spectra from black hole binaries is now available from the new models page.

I've added a note based on their paper to the XSPEC wiki which explains how to read power spectra into XSPEC.