DM-to-gas (top panel) and gas-to-star halo (bottom panel) concentration ratios as a function of their total mass for 1030 halos in the RefL0025N0376 simulation. Halos are composed of a minimum of 200 particles. Gas halos are split in two groups: gas halos w/o stars (419) in green and gas halos w/ stars (611) in red. Star halos are split into two groups of approximately equal size: low-mass halos (M_tot < 10¹¹ M_⊙), depicted by blue dots, and high-mass halos (M_tot > 10¹¹ M_⊙), depicted by yellow dots. Colour lines represent the median.