Fig. 9. Sequences (A-F) showing the hydrodynamic interactions between two squirmers under the initial condition of _in. At t=0, there is a distance of 0.3 in the perpendicular direction to the orientation vectors, where t is the dimensionless time and t=0 is the initial instant. 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 0.0 in this case. (A) t=0.0; (B) t=1.0; (C) t=1.5; (D) t=2.0; (E) t=3.0; (F) t=5.0.