Fig. 8. The scaling of swimming performance. (A) The null hypothesis (green line; b_o) was significantly different from the reduced major axis regression for measurements of swimming speed (black line; b). The measured scaling factor was not significantly different from predictions for the jet model (blue line; b_jet), but was significantly different for the paddle model (orange line; b_paddle; see Table 2 for statistics). (B) There was no null hypothesis predicted for the hydrodynamic cost of transport (see Table 1 for statistics).