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Mover events. Upper: Mover event detected in the red cell: motion (A) flows into the cell, (B) stays briefly in the cell, and then (C) leaves the cell, changing its appearance. Motion is shown in color, where warmer colors indicate faster motion. Lower: Examples of detected movers: (D) detected hands, (E) appearance variations added by tracking (each row is taken from one track), and (F) nonhand detections.
