– 18 – 0 0.5 1 0 0.5 1 0 0.5 1 -2 -1 0 1 0 0.5 1 LOG[a/AU] Fig. 4.— M$_{c}$ versus log of the current orbital separation. Dark blue points represent binaries that have experienced stable mass transfer; light green points represent binaries that have experienced a common envelope. Points in each panel have values of R$_{E}$/R$_{WD}$ in the range shown. The two red points shown in the third and fourth panel correspond to KOI-74 (on the left) and KOI-81 (on the right and slightly higher). Both KOI-74b and KOI-81b have larger radii than the mass/radius relationship for white dwarfs would indicate, perhaps indicating that they have not yet cooled. Each has values of R$_{E}$/R$_{WD}$ less than or equal to ∼ 0 . 1 .