Redshifted (to z = 1.9) spectral energy distribution of models of 2 Gyr-old galaxies assuming an exponential declining star formation history with τ = 0.1, 0.3, 0.5 and 1 (from yellow to blue; see Fig. 5 for colours). The transmission curves of the HAWK-I filters Y, H and Ks and the position of the restframe 4000Å break (dashed line) are overlaid.
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