From a5c58c3142b5266366dde02b2244bab3b5635d0e Mon Sep 17 00:00:00 2001 From: Filip Leonarski Date: Tue, 25 Aug 2026 07:11:09 +0200 Subject: [PATCH] rugnux docs: cut the XDS-convention section to the size of what it describes It is one log line and two gotchas, and it had grown a bulleted list and a closing paragraph on a par with the sections describing whole modes of the program. Same facts, one paragraph. Co-Authored-By: Claude Opus 5 (1M context) Claude-Session: https://claude.ai/code/session_01Y5XisyYxmF8mUEQjzpMRe2 --- docs/RUGNUX.md | 18 +++++++----------- 1 file changed, 7 insertions(+), 11 deletions(-) diff --git a/docs/RUGNUX.md b/docs/RUGNUX.md index 3126b11c..9ed73bc9 100644 --- a/docs/RUGNUX.md +++ b/docs/RUGNUX.md @@ -295,17 +295,13 @@ XDS convention: ROTATION_AXIS= -1.000000 0.000000 0.000000 ``` XDS is never given this geometry — the [XDS plugin](SOFTWARE_INTEGRATION.md) supplies image data -only, and XDS refines its own from `XDS.INP` — which is exactly what makes the comparison worth -having. The two laboratory frames coincide (x along increasing detector column, y along increasing -row, z along the beam), so the numbers are directly comparable. Two things to keep in mind: - -- **`ORGX`/`ORGY` are 1-based**, because XDS counts pixels from 1 while Jungfraujoch counts from 0. -- They are the **PONI**, the foot of the perpendicular from the crystal, not the direct beam — the - same quantity Jungfraujoch's beam centre is, so no correction is needed, but not the same as the - direct beam once the detector is tilted (see above). - -A tilt is reported as the two detector axis vectors rather than as angles, which is how XDS reports -it after refinement. +only, and XDS refines its own from `XDS.INP` — which is what makes the comparison worth having. The +two laboratory frames coincide (x along increasing detector column, y along increasing row, z along +the beam), so the numbers are directly comparable, and a tilt appears as the two detector axis +vectors rather than as angles, which is how XDS reports it after refinement. Two things to keep in +mind: **`ORGX`/`ORGY` are 1-based**, because XDS counts pixels from 1 and Jungfraujoch from 0; and +they are the **PONI**, the same quantity Jungfraujoch's beam centre is — so no correction is needed — +but not the direct beam once the detector is tilted (see above). ## Quick start