Illustration of the fit between simulated (solid line) and observed (dotted line) cumulative colour histograms in different situations. Bottom panel: at ze = 0.4 (528 colour measurements; seven lower limits) the fit depends essentially on the dispersion factor and a value σ = 0.05 ± 0.005 is determined by the best fit. Middle panel: fit obtained at ze = 1.0 with k = 0.6 and αν = −2.4. Top panel: fit obtained at ze = 1.2 with k = 0.9 and αν = −2. In each panel, the dashed line is for the lower limit observed colours. Whilst it is negligible in the bottom panel, this contribution increases with redshift and remains always larger than the number of objects with negative FUV flux produced by the simulation.
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