Continuous mean SED obtained by fitting the mean points (red diamonds) with a broken power law (λ_break = 3000 Å) plus a single temperature (T = 1280 K) black body. The EUV SED (λ < 1216 Å) was reconstructed as discussed in Sect. 3.1. The light blue and gold shaded area describe the best-fit broken power law and black body, respectively. The gray diamond was excluded from the fit as it is also the average of points falling below the Lyα. The black dotted lines indicate the Lyα and the normalization wavelength at 3500 Å.