Accretion rate ﹩\dot{m}{| }_{\max }﹩ at which the burst rate reaches a maximum, plotted as a function of the measured spin of the bursting neutron star. Note the pronounced anti-correlation with the spin frequency. For sources with spin frequencies below 500 Hz, we found no decrease in the burst rate at the highest accretion rates; for these sources, the ﹩\dot{m}{| }_{\max }﹩ is a lower limit (blue symbols). The error bars correspond to the width of the accretion-rate bin over which the maximum is measured, and neglect the additional uncertainty arising from the poorly constrained anisotropy correction factor (for sources other than EXO 0748−676) and the hydrogen mass fraction X in the accreted fuel.