Initial (top panel) and final (bottom panel) period distributions of the CEMP population. In model set D (dotted line) angular momentum losses are computed with Eq. (10) and γ = 2. Solid line is the standard model set A. Plus signs are the periods of observed stars. The bins are equally spaced and the width in log ₁₀   (P /days) of each bin is 0.1 (top panel) and 0.2 (bottom panel). In this and in the plots that follow the y-axis indicates the expected number of CEMP stars in each bin and the plots are normalised such that the area under the graph is the same for each model and model A peaks at 1.