Impact of the electron slope p: pulse width and time lags. Same as in Fig. 3 for Case B with four different values of the electron slope p. Colour code is the same as in Fig. 5. In the lower panel, the time lags are the same for the four cases except for the highest energy channel where the p = 2.3 and p = 2.5 cases show an important lag, whereas the p = 2.7 and p = 2.9 cases do not show any lag.