893465.fig.001a
(a) when
893465.fig.001b
(b) when
893465.fig.001c
(c) when
893465.fig.001d
(d) when
893465.fig.001e
(e) when
893465.fig.001f
(f) when
Figure 1: The Riemann solutions to (1) and (2) in all the situations.