Parameter distributions. The Color–coding separates different SED best-fitting functions. Top panels. Blue: results obtained by fitting the SEDs with a broken power-law and the relative Gaussian fit (solid line). Red: results obtained by fitting the SEDs with a power-law and the relative Gaussian fit (solid line). a) The spectral indices (β) calculated fitting the SED with a single power-law (β_op,X) and with a broken power-law (β_op, gray, and β_X). b) The hydrogen column density (N_H). Bottom panels. c) The optical extinction (E(B − V)) distributions separated according to the different extinction laws: MW (blue), LMC (green), and SMC (orange). d) The rest frame break frequency (ν_rest,BR) calculated by fitting the SEDs with a broken-power law.