- X-axis labels no longer run into each other in thumbnail versions.
- COS output files not include plot size in file name (consistent with STIS).
- COS now handles thumbnail (128 pixel) plots.  In particular, it attempts to join the segments into single arrays.
- Some improvements to the way COS x-axis plot range trimming works.
- Some minor updates to STIS specutils based on knowledge gained with COS specutils development.