The measured-modulation finder of the previous three commits is withdrawn. On a CCD sweep with a
holder arm along x it lost the arm: a small rise in the deep pixels' count promoted part of the
arm to shadow, which left the rest of the arm too few deep pixels to pass as transmitting
hardware, and the mask fell from 2.5 % to 0.4 % of the detector. On a 16-Mpixel stills detector
the per-band fit went wrong in the outer bands and masked 3.6 % of the detector instead of 0.03 %.
The shadow finder is rc178's again.
The stills defect it was meant to fix came from dividing by the factor of the wrong plane: the
background of that run is suppressed along the image's y axis, not lab x, and the division left
dim lobes over the corners on the arm search's thresholds, so that the third decimal of p moved
thousands of pixels. The degree cannot be told from the data, but the plane can. Before the
correction the mean projection is compared with the profile a polarized source gives each radial
band (rings relative to their upper decile, each sector the brighter of itself and the one opposite,
bands seen over three quarters of the azimuth); the stated degree is applied in the plane the
background follows when it follows one clearly (correlation > 0.5, at least 0.3 of a fully
polarized source's modulation), and as stated otherwise. Over 46 rotation sweeps and 11 stills runs
only that one run is turned, so every other mask is unchanged; there the mask is the 5248-pixel stop
at p = 0.99, 0.995 and 0.998.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015CeEGgpKdfkCTJb3YNMJcu
leonarski_fandClaude Opus 5.5
fc86fd4a10