(color online) Phase diagram of superconducting transition temperature versus applied pressure up to 190.6 GPa for the HEAs, combined with plots of the corresponding resistance vs. temperature. Blue triangles and dark-yellow balls in the diagram represent the zero-resistance superconducting transition temperature T_C obtained from measurements at pressure <60 GPa, while the red and green balls stand for zero-resistance T_C from the measurements at pressures up to 179.2 and 190.6 GPa, respectively. Reproduced with permission from Ref. [101].