Top: density and mean molecular weight profile of a single and a binary-stripped star model with the same reference core mass of 6.3 M_⊙ at the moment of core helium depletion (D). Gray background colors indicate the approximate location of the oxygen-rich (II), helium-rich (I), and hydrogen-rich (0) regions. Bottom: ratio of the density of the single and binary-stripped star models as a function of mass.