Mass transfer rate evolution and mass-radius relation for different systems using SBD magnetic braking and eCAML for different metallicities and white dwarf masses. The black lines, gray area, and black symbols are as in Fig. 1. The parameters for boosting and disruption were set as K = η = 50, and the donor mass and initial period were assumed to be M₂ = 0.6 M_⊙ and P_orb = 1 d, respectively. The combination of tracks for different white dwarf masses and metallicities illustrates that both borders of the gap are smeared out.