## Changes Introduced in V8.6.3

The following describes the most significant changes which occurred in the AST library between versions V8.6.2 and V8.6.3:

1. Small memory leaks in RegionRegion and FitsChanFitsChan classes have been fixed.

2. A bug that could cause an internal buffer overrun within the FitsChan class when writing out a FITS-WCS spectral axis with the “-LOG” algorithm has been fixed.

3. The test that a MappingMapping conforms to the requirements of the SIP FITS distortion scheme has been improved.

4. The astRebinSeq method of the Mapping class can now use a different weight when pasting each separate input data array into the output mosaic.