Distribution of λ_CGM as a function of ΔlogSFR in SIMBA (top panel) and TNG (bottom panel). The background is the logarithmic number of galaxies, with colours ranging from light (blue) to dark (red) indicating an increasing number of galaxies. From top to bottom panels, the blue and red lines show the median values and errors estimated from the 16^th − 84^th percentile ranges for SIMBA and TNG, respectively.