Evolution of EW(Hα) (blue), and z850LP − 4.5 μm colour (red) with age for τ = 10 Myr (solid lines) and for τ = ∞ (dashed lines). Typical error bars, as shown on the left for EW(Hα) and on the right for the z850LP − 4.5 μm colour, have been derived from error estimation on measured fluxes at z ~ 4. The effect of redddening (AV = 0.5) on z850LP − 4.5 μm is shown with the red arrow.
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