Figure 7

[Sub-case II(c)] Traveling waves: (a) a shock wave (antikink), for \(\Phi\), and the corresponding (negative pulse) for the electric field E, are depicted in the \(\xi - \tau\) plane. Upon a space reversal (\(\xi \rightarrow -\xi\)), the left panels (a, b) (for left-ward propagation) cede their place to the right panels (c, d), where propagation takes place in the forward direction, i.e. to the right of the axis. We have taken \(A=1\) and \(B=C=-1\), in these plots.