Temperature structure of a density slice at Φ = 0 post-processed with MOCASSIN. The dashed white line shows the contour for a column number density of 2.5 × 10²² cm⁻², above which the temperature is fixed to the dust temperature. The red solid lines are contours of the dust temperature. The dotted white lines are density contours for (from top to bottom) 10⁻¹⁶ to 10⁻¹³ g cm⁻³ in increments of one order of magnitude and indicate the structure of the gap. The black region is too far inside the disc to receive any energy packets in the radiative transfer calculation, which means it is shielded from stellar radiation or the diffuse field.