## Changes Introduced in V6.0-1

The following describes the most significant changes which occurred in the AST library between versions V6.0 and V6.0-1:

1. The FitsChanFitsChan class now recognises the Spitzer “-SIP” distortion code within FITS headers that describe non-celestial axes, as well as celestial axes.

2. A bug has been fixed that could cause inappropriate equinox values to be used when aligning SkyFrames if the AlignSystemAlignSystem attribute is set.

3. The versioning string for AST has changed from “ 319#319” to “ 320#320”.