## Changes Introduced in V5.7-1

The following describes the most significant changes which occurred in the AST library between versions V5.7-0 and V5.7-1:

1. - All classes of ChannelChannel can now read to and write from specified text files, without the need to provide source and sink functions when the Channel is created. The files to use are specified by the new attributes SourceFileSourceFile and SinkFileSinkFile.

2. - The FitsChanFitsChan class now ignores trailing spaces in character-valued WCS keywords when reading a FrameSetFrameSet from a FITS header.

3. - If the FitsChan astReadastRead method reads a FITS header that uses the -SIP (Spitzer) distortion code within the CTYPE values, but which does not provide an inverse polynomial correction, the FitsChan class will now use the PolyTran method of the PolyMapPolyMap class to create an estimate of the inverse polynomial correction.