图4. (a)鱼体中线各点曲率的时空分布图 和(b)鱼体上距鱼头0.2倍体长处主动弯矩随时间的变化图. 图(a)中细实线和细 虚线分别表示正曲率和负曲率的等值线,黑色粗实线(鱼体中线各点曲率达到最大值的连线)和红色虚线(鱼体中线各点主动弯矩达到最大值连线)的斜率分别表示曲率波和主动弯矩波的传播速度

Fig. 4. (a) Spatio-temporal patterns of body curvature, and (b) active bending moment wave at the location of 0.2 times of body length. Thin solid and dashed lines indicate positive and negative curvature respectively. Slopes of thick solid line (each body point reaches maximum curvature) and red thick dashed line (each body point reaches maximum active bending moment) indicate the wave speeds of curvature and active bending moment respectively