Allowed initial parameter space to form spider MSPs for an initial NS of mass 1.3 M_⊙ and f_pulsar values of 0.0 (left) and 0.5 (right). The term $M_{\mathrm{c}}^i$ is the initial mass of the companion to the NS, and $P_{\mathrm{orb}}^i$ is the initial orbital period. The color bar shows the final orbital periods ($P_{\mathrm{orb}}^f$) and the gray symbols did not attain MSP-like spins. We show the end states of the tracks, if they encountered a dynamical instability (with gray triangles or with colorful triangles depending on if onset of instability occurred during the first RLO phase or the second, respectively) or ended with one of the criteria for successful termination (star symbols). The diverging symbols are shown by gray crosses. We also show the near-P_bif binaries that passed through the RB part of the observed parameter space enclosed by dashed orange lines. The magenta triangle shows the initial parameters of the binary that reproduces PSR J0952–0607 (with observed spin period of 1.41 ms).