Fig. 23
Atlas of spectra of intermediate-type and late-type cluster members in the range 6620–6638 Å, showing the wavelength ranges used to define our index ζ1, containing Fe I lines and also sampling a TiO molecular jump, as evident from the two topmost spectra. Spectra form a temperature sequence, hotter to the bottom. The green (cyan) band indicates the range used for high- (low-)temperature lines.
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