leonarski_fandClaude Opus 5
cb08f63a52
gemmi offers two scalers and we were using the one without bounds. Its Levenberg-Marquardt path has nothing stopping the flat-solvent parameters from leaving the range the model means anything in; the alternative path that does declare bounds is behind a compile guard we have never enabled. On this corpus six datasets in fifty-one fitted a b_sol outside it, the worst at 1707 A^2. What that does is subtler than a bad scale, and worth recording because it is why nobody noticed: a b_sol that large does not corrupt the solvent term, it switches it off - 1.4% of it survives at 10 A - so the model is simply scaled without a solvent contribution and the R-factors look unremarkable. k_sol and b_sol now come from a grid search over the physical box, with the scale and the anisotropic B refitted at each candidate pair, following Afonine et al. Refitting at each point is what makes it work: clamping the parameters after an unbounded fit costs up to 0.044 in R-free, because it leaves the scale and B where the rejected fit put them. Non-physical fits go from six in fifty-one to none, and both R-work and R-free come out slightly but significantly better rather than merely no worse. Which reflections are fitted remains the caller's business - the function scales whatever it is handed - so the working-set restriction of the previous commit is not something this can undo. A crystal with no solvent-accessible volume needs no special case: its mask is empty, so the solvent term is identically zero whatever the parameters say. There is a test for that. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EFEJG6WBQv8th4UJFNe53N
Jungfraujoch
Application to receive data from the PSI JUNGFRAU and EIGER detectors.
All documentation is now placed in docs/ subdirectory and for the current version hosted on Jungfraujoch Read The Docs page.