Concentration ratio of the projected halos at z = 0.5 from the RefL0025N0376 simulation. The halos have a minimum of 200 particles. The ratios C_DM/C_gas (top panel) and C_gas/C_stars (bottom panel) are expressed as a function of the total mass of the halo. Gas halos are split in two groups, gas halos w/o stars (1290) in green and gas halos w/ stars (1875) 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. The constant dashed lines C_DM/C_gas = 14 and R_gas/R_stars = 1 are also plotted as references.