(color online) The γ-factor ((a) and (b)) and the dephasing rate γ − p x ((c) and (d)) as a function of the axial distance travelled by the electron in a uniform plasma channel for different values of positive charge density and negative current density. The values of k_E and k_B are marked by a black pentagram in Fig. 2(b). We set A 0 = 2 in all cases.