Fig. 11. Sequences (A-F) showing the hydrodynamic interactions between two squirmers under the initial condition of _in/2. The orientation vectors of the squirmers are shown as large arrows on the ellipsoids, and a thin solid line is added so that one can easily compare the angle between the two squirmers. d, explained in Fig. 12, is about 2.0 in this case. (A) t=0.0; (B) t=2.4; (C) t=3.0; (D) t=4.5; (E) t=6.0; (F) t=9.0.