Mean [Fe/Fe] vs. [Fe/H] for M giants in our sample (red circles) after excluding the fluorine abundances from the four reddest and strongest HF lines at 23 040.57 Å (R12), 23 134.76 Å (R11), 23 358 Å (R9), and 23 629.99 Å (R7). The black squares denote the stars in Pilachowski & Pace (2015), the blue circles the stars in Jönsson et al. (2014a), the plus signs the stars in Guerço et al. (2019a), and the gray diamonds and inverted triangles the stars in Ryde et al. (2020).