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Fig. 13

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Left: M/Lλ ratio in J-, H-, and K-bands of the young stellar population as a function of age. Different colors indicate the three bands. The solid line shows an instantaneous star burst, the dashed line plots continuous star formation (1  M  yr-1). Right: M/Lλ ratio as function of the mass fraction of a 0.1 Gyr population added to an old (10 Gyr) population.

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