The three plots include the clean high-confidence sample, and all APOGEE, GALAH, and SAGA stars with [Mg/H] lower than −1. The APOGEE dataset has been filtered to exclude all stars from dwarf galaxies and GCs. The running mean shown for each dataset goes from the minimum to the maximum [Mg/H] with bins every 0.5 dex for the three surveys, and 0.2 dex for the high-confidence stars due to smaller sample size and spanning a smaller metallicity range.