H₂ abundance obtained by processing the models with PRODIMO. The dashed white lines are contours for values of (from top to bottom) 10⁻³, 10⁻², and 10⁻¹. The dashed grey lines represent the 2.5 · 10²² cm⁻² radial column number density contour. The solid lines indicate where the o-H₂ 2.12 μm emission reaches 15% and 85% in the radial (integrated inside out) and vertical (integrated from top to bottom) directions. For better comparison, each panel also contains the emission regions of the other models, shown as dotted lines.