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Fig. 15

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Pseudo-equivalent widths of the alkali lines in the J-band as a function of the SpT derived in Sect. 4.1. The sample is divided according to the age classes defined in Sect. 2.1. The color and marker scheme for our sample is the same as Fig. 14. The purple circles are field objects from McLean et al. (2003) and Cushing et al. (2005). In the right panels of each sub-figure, there are the KDE for each age class (color-coded accordingly).

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