Phase diagrams of gas within R_200c of Milky Way-mass halos in the Fid. TNG run (left) vs. TNG-CR (right). The crosses in both panels correspond to (local) maxima of the cold (< 10^4.5 K) and hot (> 10^5.5 K) phases, while dashed curves show contours drawn at the 10% level. For ease of visualization, the dotted curves and gray crosses on the right overplot the corresponding features from the left panel. While the peak density of the cold phase is larger by ∼0.3 dex in Fid. TNG with respect to TNG-CR, the hot phase peak is only offset by ∼0.1 dex in density, and ∼0.05 dex in temperature. Furthermore, contours are more broad in Fid. TNG as compared to TNG-CR, implying larger variation in these gas properties at fixed halo mass.