Temperature maps from RAMSES and POLARIS. The left panel presents the temperature map of the RAMSES simulation cube before the POLARIS radiative transfer, from the slice centered on the sink particle (in the simulation the only central source of heating is the luminosity of the central protostellar object, with L_★ = 0.58 L_⊙). The right panel shows the temperature resulting from the radiative transfer performed by POLARIS for the reference case (a_max = 10 µm, f_high−J = 1, and L_★ = 20 L_⊙). The point is not to compare the temperature values across the two maps, but to highlight that the heating mechanisms are different - in the RAMSES simulation the dynamics of the gas induce a significant heating of a thin layer surrounding the high velocity jet.