Ratios of [K/Fe] as a function of the effective temperature in stars of ω Cen from the recent analysis by Alvarez Garay et al. (2022: AG22). Stars are separated in metallicity bins [Fe/H] ≤ −1.70 dex, −1.70 <  [Fe/H] ≤ −1.30 dex, and [Fe/H] >  −1.30 dex, from left to right. The vertical line indicates the approximate temperature level of the RGB bump in ω Cen (G ∼ 14.0 mag) on the temperature scale of AG22. In each panel we report the Pearson linear regression correlation coefficient, the number of stars in the metallicity bin, and the two-tail probability of the linear regression occurring by mere chance.