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Comparison between maximum possible moment arms of the elbow joint extensor (Ex: vertical axis) and flexor (Fl1 or Fl2, whichever is larger: horizontal axis) muscles. See Figs 3 and 5 and main text for the details of the measurements and the locomotor ability categories. Animals plotted on the upper left possess relatively large extensor moment arms (e.g. upright quadrupeds), and the one on lower right possesses relatively large flexor moment arms (e.g. suspended quadrupeds).
