Average neutrino energies for the gray simulation (bright lines) compared to the simulations presented in O’Connor et al. (2018; semitransparent colored lines). The purple lines indicate the results from the simulation based on the original gray transport from Foucart et al. (2016), and the black lines represent the result from the simulation using the improvements detailed in this work. The average energy of the electron neutrinos (solid lines) and electron anti-neutrinos (dot-dashed lines) are shown in the left panel, and the average energies of the heavy-lepton neutrinos are shown in the right panel (dashed lines). Time is given in seconds after bounce.