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Fig. 3. Maximum force output by Group 2 motors as a function of their mass. The
least squares fit (solid line) is: Fmax=55
M0.999. The dashed line is the scaling fit for Group 1
motors for which Fmax scales as M0.67
(Fig. 2). Inset: the frequency
distribution of mass specific force output for all of the Group 2 motors on
the main plot. Maximum force output (N) and motor mass (kg).