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The movement permitted alongside that share before the gap reading is refused.
A tenth. It was introduced as a guard against the case where a handful of reassigned observations sit in a tail and move the fitted density a long way, and it is still that — but the joint sweep showed it is also the binding constraint of the pair, not the share. Past 0.12 the reading degrades quickly: at 0.15 with a share of 0.10 precision falls to 76.7%, which is barely above the 57.4% baseline and not worth reporting as a signal.