906414.fig.001a
(a)
906414.fig.001b
(b)
Figure 1: (a) shows relative velocity distributions for two identical beams (sodium with  K), for crossed beams (cb) and for counter-propagating (cp) beams, respectively. The arrows indicate the mean relative velocity. (b) shows relative velocity distributions for the two configurations where a sodium beam with  K collides with a potassium beam with  K.