Simulated systems shown in the M_donor − P_init plane. The color bar shows the mass of the helium transferred to the accretor at the end of the simulation run. Systems denoted with a filled circle undergo unstable helium ignition at the end of their evolution (HeDef). Filled circles with a black border indicate helium detonation (HeDet). In systems denoted with a square, helium burning in the donor star ends before helium ignition on the accretor (DD I). Upward pointing triangles indicate a CO WD with a He envelope with a second CO WD (DD II) and downward pointing triangles a system composed of two bare CO WDs (DD III). Systems denoted with a black x could not be resolved because of numerical issues related to the utilized opacity tables. Empty circles denote the occurrence of mass transfer rates exceeding 10⁶ M_⊙ yr⁻¹, leading to numerical instabilities.