Fig. 10. Cell velocity distribution obtained on the basis of all tracks detected in all runs. (A) Surface plot of the two-dimensional probability density function F(V_x,V_z); (B) surface plot of the reconstructed three-dimensional probability density function F(V,) (compare with Fig. 5); (C) surface plot of ln[f (V,)]; (D) sections of ln[f (V,)] at different values of V, i.e. view of C from the tip of the V axis (compare with Fig. 11).