Change in heating and cooling balance with the new escape probability treatment and the new 2D concept to apply UV molecular shielding factors. The plots show the leading heating process (top) and the leading cooling process (bottom) in a zoomed-in disc region responsible for the disc IR line emissions. Processes are only plotted when they fill at least 1% of the area in these plots. The dashed lines mark the visual disc surface A_v,rad = 1 and the vertical optical extinction A_V = 10. The model includes 103 heating and 95 cooling processes with 64910 spectral lines altogether.