Bremsstrahlung spectrum of the lores grid’s final time step, unmodulated (dashed blue curve) and modulated by a homogeneous ISM between the model and the observer with T = T_ISM (solid red curve). Spectral domains of microwaves, far infrared (FIR), infrared (IR), ultraviolet (UV), soft X-ray (SX), and hard X-ray (HX) are delimited by vertical lines; the shaded area corresponds to the optical.