Radial profiles of median of absolute value of distribution of particles in vertical (z) direction, , (normalised by the initial value, ), for thin-disc (left panels), thick-disc stars (middle panels), and total (thin+thick) disc stars (right panels), as a function of time (shown in colour bar) for the model rthickE0.5. Here, denotes the initial value (used for the normalisation; for details, see text) where i = thin, thick, thin+thick, respectively. The thin disc b/p remains much stronger as compared to the thick disc b/p.