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Fig. 6.

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Distribution of the ARMC characteristics in histograms (shaded vertical bars) and kernel densities (solid lines), revealed from the Hi-2.1 images. From top to bottom: duration, distance, speed, and intensity. The duration and distance distributions are both unimodal, which indicates that they all belong to one group. The speed and intensity distributions are multimodal, which indicates the existence of ARMC groups.

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