Fig. 4
Lower: the Ks band luminosity function (LF) of the resolved stars in NGC 205. Black line is the LF for the measured stars, and the gray line is that for the completeness-corrected number of stars. Upper: the second derivatives of the observed LF and the completeness-corrected LF. Vertical dotted lines in each panel indicate the determined magnitudes of the TRGB (i.e., Ks = 18.1 mag).
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