IMF slope – metallicity relation. All independent IMF slope and metallicity measurements within our sample are shown in light blue, while dark blue symbols indicate the running median. Error bars indicate the (bi-weight) standard deviation. As in previous studies, we find a significant correlation between the local slope of the IMF and the metallicity, as indicated by the Pearson correlation coefficient on the top left corner of the figure. The ξ value for a Milky Way-like IMF is marked with the dashed horizontal line.