Cumulative orbital-period (P_f) distributions for SAGA CEMP stars with −2.8 ≤ [Fe/H] ≤ − 1.8 (shaded area). The lower limit of the observed distribution is determined assuming that all CEMP stars are binaries, whereas to determine the upper limit we assume that only CEMP-s stars are in binaries. Our model sets A and I_L05 are shown as solid and dotted lines, respectively. The 0.2 dex bins of the model distributions are equally spaced in log ₁₀(P_f/days).