(M_WD,P_orb)-relation for Z = 0.02 (top panel), Z = 0.01 (second panel), Z = 0.001 (third panel), and Z = 0.0002 (bottom panel). The grey shaded area denotes the LMXB systems that undergo a temporary detachment (see text). The purple circles represent the basic models, the orange stars the models with diffusion only and the blue squares the models with diffusion+rotation. Over-plotted are the theoretical relations by Tauris & Savonije (1999) and Lin et al. (2011) for the respective metallicity.