Zoom-in of Fig. 1 with the observed (FUV−NUV) GALEX colours. Superposed in red is the colour distribution for the mean spectral energy distribution adopted for the simulation and shown in Fig. 6. Two values of the power law index αν in the wavelength range below 1000 Å rest frame have been used: −2.4 (top), −1.6 (bottom). Such a diagram was used to determine the index value between 1000 Å and 1190 Å (rest frame) matching the best the observations in the range ze < 0.6 (see text).
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