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. 2020 Nov 5;15(11):e0240127. doi: 10.1371/journal.pone.0240127

Fig 4. ‘Degree of motion’ in amplified video sequence of a periodic stretched gel as function of amplification factor for three stretching amplitudes (0°, 1° and 3° motion of the step motor).

Fig 4

The white region (the region above the continuous black line that limits the gray region) represents real motions and the gray region represents noise interpreted as movement.