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Summary scatterplot of all experimental outcomes: the period index is reported on the X-axis and the regularity index is reported on the Y-axis. Data from the four sensors are reported in separate plots. Different markers/color coding (refer to embedded legend) identify trial conditions (W1, W2, and W3 are for walking at 1.0, 1.4, and 1.8 m/s, respectively; R3 and R4 are for running at 1.8 and 2.2 m/s, respectively). The regularity index evidences an apparent ceiling effect.
