Neutrino flux asymmetry at 170 ms, 200 ms, 342 ms, 600 ms, and 1.3 s (from top to bottom), respectively. The 4π-maps show the relative angular variation ΔF_o/⟨F_o⟩ of the total (i.e., sum of all neutrino flavors) neutrino energy flux density over a sphere (normalized to its angular average) for model W15-4. The maximum value is given in the lower right corner of each panel. Regions of higher emission are shown in bright yellow, while orange, red, green, and blue colors indicate successively less emission. Note that the color scale of each panel is adjusted to the maximum and minimum values at the corresponding time. The total energy loss rate due to neutrinos is given in the lower left corner.