Solid line: evolutionary tracks of pulsars in LMXBs with a relatively low accretion rate during phase IV, Ṁ = 10^-11 M_⊙ yr^-1, a wind accretion rate during phase III of Ṁ = 10^-15 M_⊙ yr^-1, and an initial magnetic field of 3 × 10¹³ G. The end of phase I is marked with a diamond. The main-sequence phase ends at point (F) after 4.5 × 10⁹ years and marks (A) to (C) represent intervals of 10 Myr after the end of the main sequence. The total duration of the fast accretion phase is 4.62 × 10⁷ years. Dashed line: same as dotted line but for an initial magnetic field of 6 × 10¹² G and a wind accretion rate of Ṁ = 10^-14 M_⊙ yr^-1. Dot-dashed line: same as solid line but with a wind accretion rate of Ṁ = 10^-10 M_⊙ yr^-1. The vertical line (in orange) is the observational constraint on the magnetic field and period.