Model distribution of present-day mass transfer rate versus orbital period for hydrogen-rich LMXBs in the Galactic Bulge. White squares correspond to 0.4 or fewer LMXBs. The highest density in the figure is 10^2.7 ≈ 500 per pixel. The black line shows the critical mass transfer rate for thermal-viscous disk instability, given by Eq. (2) with M_a = 1.4 M_⊙ and f = 1 (solar composition). The star formation history width σ = 0.5 Gyr.