Uncompressed (blue) and bulk (green) rocky planet densities vs. host star [Mg/Fe] for planets hosted by both FGK (circles) and M dwarfs (triangles), colored by planet radii values. Rocky solar system bodies (Moon, Mercury, Venus, Earth, and Mars) are plotted for comparison as orange diamonds. Our best-fit linear models from our MCMC fitting routine are plotted as blue lines along with their associated 1σ confidence intervals. Pearson correlation statistics for the uncompressed density case are provided in the bottom left corner, considering just the FGK-hosted rocky planets and the entire FGKM sample. We label the high-confidence and possible thick disk planets TOI-561 b and Kepler-10 b, respectively.