Fig. 4
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Abundances of silicon, titanium, and iron (relative to the solar abundances of Asplund et al. 2021) vs effective temperature for stars in NGC 6388 (red symbols) and stars affected by diffusion in NGC 288 (magenta asterisks, Moehler et al. 2014), NGC 6397 (blue lozenges), and NGC 6752 (green crosses). The grey symbols mark abundances for HB stars in NGC 1904 (Fabbian et al. 2005), NGC 2808 (Pace et al. 2006), NGC 6205, and NGC 7078 (Behr 2003).
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