Fig. 3.

Stability margins (unitless) at first step lift-off based on the BOS and functional stability boundaries at (a) perturbation level 3, (b) level 4, and (c) level 5. Values and error bars are mean and SEM. ^*Indicate a significant difference between single and multiple responses. ^†and ^‡indicate that the stability margin is significantly different from zero. (a) ^*p = 0.003, ^†p < 0.001, ^‡p = 0.006; (b) ^*p = 0.003, ^†p < 0.001, ^‡p = 0.004; (c) ^†p = 0.034.