Fig. 8
Comparison of simulations (open symbols) and observations (thin curves and 1σ deviations): colour indices (top) and variability ratios as functions of redshift for the best-fit model with with small line variability (κ = 0.11; second row), the same model with large line variability (κ = 1; third row), and for a model where only the line flux is variable (bottom), respectively.
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