Effective potential for two - electron atoms for different charges

Dependence on η=(((Subscript[r, 1])-(Subscript[r, 2]) )/((Subscript[r, 1])+(Subscript[r, 2]))) for different Z

To change Z, slide a computer mouse along the vertical bar. Minima are marked by filled circles (●), and maxima or saddle points by empty circles (○).