Relations between the parameters of detached He-star+WD systems which will evolve into He-star AM CVns. The subpanels show the relations between the masses of WDs and post-CE P_orb (a), between the masses of the nascent stripped He star and P_orb (b), between the masses of WDs and stripped star components (c), the differential (red line) and cumulative (black line) distributions over P_orb (d), the differential and cumulative distributions over M_WD (e), and the differential and cumulative distributions over masses of He stars (f). The plots in the panels are normalised to unity.