Shock radius (top) and total (i.e., summed over all flavors) energy loss rate due to neutrinos (bottom) as functions of time for model W15-4. In the upper panel, the black curve shows the angle-averaged mean shock radius, the blue (red) curve gives the maximum (minimum) shock radius, and the vertical dashed line marks the time of the onset of the explosion as defined in Sect. 2.3. In the lower panel, the blue and red curves show the time evolution of Λ_max(Ω,t) and Λ_min(Ω,t), the maximum and minimum value of Λ(Ω,t) (Eq. (8)) on a sphere of 500 km radius, respectively. The black line gives the corresponding surface-averaged value Λ(t) (Eq. (13)). Note that the luminosities imposed at the inner radial grid boundary are kept constant during the first second and later are assumed to decay like t^−2/3.