Number density distribution of NS+MS, NS+HG, and NS+GB binaries on the mass (log M₂)–period (log P_m) plane when the MS, HG, and GB companion just fills its Roche lobe. The regions enclosed within the solid and dashed lines are parameter spaces for producing sdB+NS binaries from the RLOF channel and from the CE ejection channel, respectively. The prescriptions for NS kicks and the value of α_CE are indicated in each panel.