The mosaic BAF split is now estimated over heterozygous calls against each probe's expected noise (the reference heterozygous spread scaled to the sample), inverting the median of |N(+-d, sigma)|. A mosaic loss lacking the heterozygous calls its PFB predicts gets MF 1 and is promoted (CYTO-020). Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01814GKVzZVL3FuF3DeiZXhv