Total emitted XUV energy by both stars between ages of 1 Myr and either 1 Gyr (left column) or the end of their lifetimes (right column). Upper panels: values as a function of the initial orbital separation. Lower panels: values as a function of the orbital separation at 5 Myr. The four cases shown in each panel differ only in the initial rotation rates of the two stars, as indicated in the legend.