Analysis of 17 480 halos at z = 0.5 of RefL0025N0376 EAGLE simulation. The distribution of the sphericity, c/a, is shown as a function of the total mass of the halos for DM (left panel), gas (middle panel), and stars (right panel). Gas halos are split in two groups: gas halos w/o stars (1440) are in green and gas halos w/ stars (682) are 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.