The background trimmed mean is gated on the beam (monochromatic vs broadband), not on the acquisition mode: a monochromatic still (zero bandwidth) already gets the trim by default, only broadband (non-zero bandwidth: pink-beam / DMM) data keep the high-side sigma-clip. The comments, the settings doc and the --background-trim help wrongly implied the trim was rotation-only / that stills keep the sigma-clip. Wording only; no behaviour change. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>