let matchingScoreThreshold1 = 0.6
// All ellipsee with a score below this is removed.
-let matchingScoreThreshold2 = 1. / 50.
+let matchingScoreThreshold2 = 1. / 100.
type private EllipseScoreFlaggedKd (matchingScore: float, e: Ellipse) =
let mutable matchingScore = matchingScore