Cloud SED (L_ν) for the reference snapshot as a function of wavelength (λ). The solid blue line shows the UV-to-FIR emission of the cloud obtained from the RT post-processed along the reference observing direction. The dashed blue lines correspond to the other five observing directions. The shaded area brackets the fluxes of all the observing directions adopted. The dashed black line indicates the intrinsic (dust-transparent) emission of the cloud along the same observing direction. As a reference, we also show the emission of a local cloud from the analytic model by S20 in the homogeneous case (green line) and in the radiation–pressure case (magenta line).