## Changes Introduced in V8.0.5

The following describes the most significant changes which occurred in the AST library between versions V8.0.4 and V8.0.5:

1. The SkyFrameSkyFrame class has a new attribute called SkyTolSkyTol, which specifies the smallest significant distance within the SkyFrame. It is used to decide if the MappingMapping between two SkyFrames can be considered a unit transformation. The default value is 0.001 arc-seconds.

2. A bug has been fixed in the FitsChanFitsChan class that prevented illegal characters within FITS keyword names (i.e. characters not allowed by the FITS standard) being detected. This bug could under some circumstances cause a subsequent segmentation violation to occur.

3. A “BadKeyName” warning is now issued by the FitsChan class if a FITS keyword name is encountered that contains any illegal characters. See attribute “WarningsWarnings” and function “astWarningsastWarnings”.