Atmospheric properties required to calculate the multi-group scattering opacities. Panel (a): Density and temperature of the reference atmosphere. Panel (b): Binned optical depth, . The white contour shows the range of T,p values encountered in the three-dimensional simulation. Panel (c): Intensity, J^pp, used for averaging in the streaming regime. Panel (d): Photon destruction probability calculated using the van Regemorter approximation.