The FSM chip anchored against disadvantaged_pct (a different measure, FSM6+CLA) whenever fsm_pct was null — which it always was, since the performance df has no fsm_pct. New fact_census_benchmarks mart supplies pupil-weighted FSM/EAL means per phase; the KS2-column medians that produced a bogus 50% 'secondary disadvantaged' anchor are gone. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0146VHeLAWjDVE2B5uU67jCB