leonarski_f f199f23c54 Radial background: one mechanism for stills and rotation, decided per run on empty apertures (D5)
Wherever the correction is set for the whole run its curve is the frame's peak-excluded ring
background (the adaptive spot finder's, whole frame) and the ring's clip follows it - as stills have
done since integ-pal - now rotation too. One empty-aperture measurement (BackgroundAperture) decides
it for both workflows:

- The apertures' corrected difference is now taken as the integrator applies the correction: the
  clip follows the curve (each ring pixel's threshold raised by the curve's rise from the centre, in
  whole counts) as well as the kernel correction. Before, the tally clipped flat, so it measured a
  correction the engine never applies.
- Rotation measures the stencils the spot width can give it (r1 = 4, 5, 6 with the ring-area rule,
  RotationStencil) and decides on the one it gets, and separately on the pre-adaptive stencil the
  geometry pre-pass and the starvation guard return to.
- Stills: on wherever the corrected ring predicts the empty disk better (unchanged rule).
  Rotation: the frame's curve on every image only where it takes >= 10% of the apertures' mean
  square error away (ROTATION_RADIAL_MIN_GAIN); otherwise the existing per-image ice gate with the
  reflections' curve is left exactly as it was. Why a margin on rotation only: a still has no other
  correction, a sweep has one. Measured over 18 rotation sets (forced on every image): photon-counting
  sweeps gain 0.1-5% on the apertures (z 3-4) and lose ISa/anomalous signal when corrected
  (insulin, lysozyme, cytochrome c; 9yzk R-free +0.009 at 1.2%), as the earlier stills-rule trial
  found; the home-source CCD and smooth-ice runs gain 13-31%.

Result (CPU A/B vs 87684012f, 18 rotation sets): 12 .hkl byte-identical (every photon-counting
control without ice), 5uth R-free 0.210 -> 0.201 / ISa 10.4 -> 10.8, the ice set neutral; stills:
lcls242_s turns the correction on (the clip-following tally), R-free 0.2399 -> 0.2406.
No integration kernel changed; the tally is host code. Tests: BackgroundAperture_CorrectedClipFollowsTheCurve,
RadialHelps margins.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015CeEGgpKdfkCTJb3YNMJcu
(cherry picked from commit dd3f3f2da39f5338e7dda1874bbdd535229bce98)
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Jungfraujoch

Application to receive and analyse data from the PSI JUNGFRAU and EIGER detectors, together with rugnux, its program for processing stored diffraction data - rotation and serial, macromolecular and small-molecule - from images to merged reflections.

All documentation is now placed in docs/ subdirectory and for the current version hosted on Jungfraujoch Read The Docs page.

S
Description
Jungfraujoch Data Acquisition System, Rugnux Data Processing Application, and Diffraction Viewer
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