2D constant T_kin slices from a 3 dimensional grid of for SO (top), SiO (middle) and CS (bottom). Contours of constant (darker); 25 (lighter) on a column density vs. H₂ density grid for detected lines are shown. The background shades show the optical depths τ = 0.05 (darker region) and 0.1 (lighter region) for all species. These optical depths correspond to the maximum optical depth out of all the lines modeled.