Fig. 7. The cell swimming motion as a function of the amplitude-to-wavelength ratio a_t/_t in model cells with a transverse flagellum. Solid, broken and dot-dashed lines indicate h2TF, h9TF and sTF cells, respectively. Horizontal and vertical lines show the average value for observed cells (Miyasaka et al., 1998; Table 1). (A) Speed ratio V_X/(f_tt). (B) Frequency ratio _c. (C) Efficiency . a_t, amplitude of transverse flagellum wave; _t, wavelength of transverse flagellum wave; V_X, net displacement speed of cell; f_t, frequency of transverse flagellum wave; _c, angular speed of cell. See Table 1 for model cell abbreviations.