Dear CrystFEL users and interested crystallographers, CrystFEL version 0.9.1 has been released! This is a maintenance and bug-fixing release which fixes a few problems which crept into version 0.9.0. The most important fixes are: 1. The unit cell comparision function, which was completely re-written for CrystFEL 0.9.0, was updated to fix a mis-indexing problem with certain types of unit cell. This may increase indexing rate or fix wrong output cells in those cases. 2. The default unit cell angle tolerance, which was accidentally set to 1.5 radians in CrystFEL 0.9.0 as a result of the above changes, was re-set to 1.5 degrees. 3. Build compatability was added with very new HDF5 versions (>= 1.12) and older versions of zlib (< 1.2.3.5). See the release notes and the ChangeLog for full details of the other improvements. Release notes for version 0.9.1: https://www.desy.de/~twhite/crystfel/relnotes-0.9.1 Change log: https://www.desy.de/~twhite/crystfel/changes.html Thanks for all of your past and future feedback and contributions, and your continued use of CrystFEL. As ever, please contact me directly if you would prefer to be unsubscribed from this mailing list. CrystFEL website: https://www.desy.de/~twhite/crystfel CrystFEL tutorial: https://www.desy.de/~twhite/crystfel/tutorial Tom