Distribution of [C/Fe] in the CEMP population. The histogram shows the observed distribution in our data sample, with Poisson errors. The solid, dotted and dot-dashed lines are model sets A, C_q and E_q respectively. Model set A is our default, C_q and E_q are the models for q-dependent WRLOF. Model set C_q assumes a spherically symmetric wind. Model set E_q is calculated with γ = 2 in Eq. (10).