Background-subtracted descriptive gyro plot

Preserve the original raw plot and all 53 selections. Add a companion using the same recorded aircraft-right-axis gyro bins on the existing uniquely matched receiver support. Omit unsupported edge seconds explicitly; do not interpolate or invent corrections. Preserve gaps and both signs.

Subtract only the conventional specified background field projected onto a declared level aircraft axis with heading equal to receiver-derived globe course. Its positive nose-down contribution is Omega cos(latitude) sin(course), with Omega fixed at 7.2921150e-5 rad/s. This is not a fitted or independently measured field. Assume no upstream removal for this display. Keep globe transport, aircraft motion, bias and other errors in the remainder. Do not subtract the whole globe prediction or fused navigation rates.

Reuse hash-verified companion results and saved receiver selection. Check each new raw sum and field sum against its already published matched-support summaries: the field sum must equal specified-field globe minus zero-field globe. Plot all 53 curves and their median; distinguish the common interval from the changing subset. Nose-down remains positive and increases downward. Do not flip curves or tune a rate to make them agree. Publish raw, subtracted and remaining angles.

Finite plotting scope: 53 stretches, at most 1,000 matched bins and 1,500 receiver fixes per stretch, 53,000 projections total, one worker/four numerical threads, 180 cooperative seconds. No source decoding, native integration, optimizer starts, new model decision or statistical claim. Ordinary local tests cover independent cardinal directions, sign, duration weighting, retained transport, ignored fused channels and unfilled gaps. Provenance records source/output hashes and support differences. This is a visualization, not a new Earth-model study.