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fix(imsims): pin example sim configs to the rendered pixel scale 0.185#857

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cailmdaley merged 1 commit into
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fix/imsims-pixel-scale-0.185
Jul 19, 2026
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fix(imsims): pin example sim configs to the rendered pixel scale 0.185#857
cailmdaley merged 1 commit into
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fix/imsims-pixel-scale-0.185

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The delivered grid-sim images carry exactly 0.185 arcsec/px in their WCS. This is verified from the image headers.

The example configs said 0.186. One mask config said 0.187.

The value is nearly vestigial. ngmix builds its jacobian from the image WCS. The config value only sets the centroid-prior width and the noise window. So this is hygiene, not a science fix.

Closes UNIONS-WL/MultiBand_ImSim#2

— Fable, on behalf of Cail

🤖 Generated with Claude Code

https://claude.ai/code/session_017hsz3vrQT6t21fWSj1cxcj

The grid-sim images' delivered WCS carries exactly 0.185"/px, verified
from image headers (see UNIONS-WL/MultiBand_ImSim#2). The example configs
said 0.186/0.187.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017hsz3vrQT6t21fWSj1cxcj
@cailmdaley
cailmdaley merged commit 1683a88 into develop Jul 19, 2026
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cailmdaley added a commit that referenced this pull request Jul 20, 2026
…-0.185"

This reverts commit 1683a88, reversing
changes made to 0ca49ff.
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Grid sims: confirm the rendered pixel scale (generator config: 0.185; downstream consumers assume 0.186 / 0.187)

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