R(phi) rotates the observations by +phi about the stored axis, which makes it
the inverse of the crystal's own rotation - the reading under which the formula
as written is correct, and the same convention that has the exported MTZ batch
axis and the XDS echo negated. Said explicitly, so a reimplementation cannot
take R(phi) for the crystal rotation and land at 2*phi.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EFEJG6WBQv8th4UJFNe53N
leonarski_fandClaude Opus 5
f68fd3d7af
