ψ values given by Eqs. (4) and (9) for main-sequence stars of spectral types F4-M4 at an age of 1 Gyr (empty circles), 4 Gyr (2-3 Gyr for F-type stars; filled circles), and 10 Gyr (empty triangles) using gyrochrones from Lu et al. (2024). For 10 Gyr, only values for stars with masses below ∼0.8 M_⊙ are shown, as more massive stars have evolved off the main sequence by that age (Choi et al. 2016). The 4 Gyr results are almost identical to those in Fig. 3, except for the larger M4 value due to the change in the gyrochronology model.