Evolution of $t{\prime }_B/t{\prime }_{\mathrm{dyn}}$ and Γ_c, 0/Γ_m during the pulse duration. Left: Evolution for case A. The contour lines for values of α = −1.5, −1.25, −1, −0.75 are shown, using the simulations obtained for Y_Th, 0 = 0.1; w_m = 10² (adopted from the upper right plot of Fig. 3). Right: Evolution for case B. The same contour lines are shown for α, using the simulations obtained for Y_Th, 0 = 10²; w_m = 10² (adopted from the middle-left plot of Fig. 3). We have overplotted (in grey lines) the values of $t_{\mathrm{B}}\prime /t_{\mathrm{dyn}}\prime$ calculated using the parameters of the dynamical evolution (Γ_m and density in the co-moving frame) for case (A) and case (B) and assuming a constant ratio $t{\prime }_{\mathrm{B}}/t{\prime }_{\mathrm{pl}}={10}^6$, 10⁷, or 10⁸. Red crosses show values at the maximum of the pulse, that is, where the dissipated energy per unit mass obtains maximum.