Fig. 12
a) Synthetic spectra for an N-poor (magenta), a N-rich (black), and a C-rich star at the RGB bump of a GC with [Fe/H] = −1.23 (see Sect. 4 for the various abundances used). Superimposed are the transmission curves for the uvbyCa filters; some features of interest are indicated (see text). b) The same, but for a star above the RGB bump.
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