Orbital period evolution versus companion mass of the simulated binaries for β = 0.3 with an initial NS of mass 1.3 M_⊙ and f_pulsar values of 0.0 (top left), 0.05 (top right), 0.1 (bottom left), and 0.5 (bottom right). The term M_c is the mass of the companion to the NS, and P_orb is the orbital period. The color bar shows the changing surface abundance of the companion. We also compare our tracks to estimated M_c, min and observed P_orb for BWs (black crosses) and RBs (red crosses), and huntsmen spiders (green crosses), including whether H-lines have been detected (filled circles) or not (filled triangles) or if it is unknown (crosses), from Nedreaas (2024, and references therein). The green star is the huntsman candidate 2FGL J0846.0+2820, observed by Fermi-LAT (Swihart et al. 2017) (surface H is unknown). The three tidarrens (J1311–3430, J1653–0159, and J0636+5128) are also shown. The initial binaries have a MS star (range of 1.0 to 4.5 M_⊙) and initial periods of 0.6 to 4.0 d.