Collective HR diagram of all mergers (filled circles) and all binary BS (asterisks) from Figs. 6−8, together with the corresponding isochrones. Rapidly rotating mergers are additionally marked with squares. The position of the eclipsing binary V60 from M55 and of the model 0.89+0.8(1.9) are plotted as a diamond and a plus sign. The ZAMS and the blue boundary of the binary BS region determined by Tian et al. (2006) are shown as a dotted and broken line. Long dashes mark the adopted red boundary of the BS region.