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+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