Slide 1 (current vs ideal): drop the lr_reduction (sibling) box from the TODAY panel; the tangled-state story is tight enough with quicknxsv2 + mr_reduction + Mantid alone. Label every inter-box arrow "Calls" so scientists do not read them as inheritance relations. Reduce bullet density. On the IDEAL side, make the two-instrument story visible: quicknxsv2 UI and an REF_L UI both Call into ref_core. Slide 2 (API mapping): the right column is now labelled "lr_reduction (next branch)" with the subtitle "Mantid-centric · REF_L · unpolarized (standard reduction)". All references to lr_reduction:new_workflow removed. Title shortened to "mr_reduction↔️ lr_reduction". This is the Mantid-centric pair; the new_workflow + quicknxsv1 cross-reference is deferred to after the hack-a-thon per scientist feedback. Slide 3 (silent defaults): collapse from 5-column (Parameter / GUI / auto / Physics / Observable) to 4-column (Parameter / GUI / auto / Effect icon). Icons are inline SVG pictograms summarising each tension. Rewrote the ErrorWeightedBackground row text per scientist feedback: the uniform-mean explanation stays, the inverse-variance-mean text is dropped, and the observable is reframed as "backgrounds used when high-intensity off-specular reflections are present unfairly bias low-count reflectivity." Icon for that row is a detector diagram showing bright off-spec ovals intruding on the background band — simplified from the scientist's sketch slide3-ErrorWeightedBackground-Explanation.jpg. New detail slides 3a through 3e, one per silent default: 3a ErrorWeightedBackground — physics (plain mean formula + why inverse-variance is not used for REF_M) + observable (detector contamination diagram + R(Q) cartoon showing an unphysical dip) 3b CropFirstAndLastPoints — physics of edge-bin trimming + observable showing both paths' R(Q) with the autoreduce path's dropped endpoints marked 3c RoundUpPixel — specular-pixel rounding in constant-Q binning, number-line diagram of 126.9 (GUI) vs 127 (autoreduce) 3d AcceptNullReflectivity — failure-mode difference, side-by-side panels showing the GUI's zero curve vs the autoreduce RuntimeError stack 3e UseSANGLE — current agreement but with a semantic inversion trap (UI checkbox "Trust DANGLE" unchecked → Configuration.use_dangle=False → MRR UseSANGLE = not use_dangle = True). A rename of use_dangle without auditing the call site would silently flip every θ. Co-Authored-By:Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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