Fig. 8.
Ks-band de-reddened luminosity function. The upper and lower panel show F1 and F2, respectively. The red line depicts the best fit. It is a smoothed 13.5 Gyr, Z = 0.04 LF. Considering the atomic diffusion in the model would reduce the age ∼0.7 − 1 Gyr (see main text). The green dashed line corresponds to the LF from BaSTI models, without applying any smoothing.
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