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. 2020 Feb 3;11:11. doi: 10.1186/s13229-019-0305-1

Fig. 1.

Fig. 1

Motion energy analysis. a Top row, still frame of video showing a dyad with the ROIs as boxes of different colours. b Time series of individual motion energies (y-axis: motion energy values; x-axis: time in frames (rate: 25 frames per second)