Examples of evolutionary tracks for CVs starting mass transfer below the gap. The initial donor mass is assumed to be M₂ = 0.15 M_⊙ and with initial post-common-envelope periods of 0.10 (black) and 0.25 days (red). If a CV is born with a crystallizing white dwarf, the magnetic field is generated before the period minimum is reached and the system detaches for a relatively short period of time (∼130 Myr) and then evolves as a magnetic CV through the period minimum (red dashed track). If the white dwarf does not start to crystallize before the onset of mass transfer, the binary detaches after it has passed the period minimum when the accretion rate became low enough to allow the white dwarf to crystallize (black solid track).