The survey sky coverage. Dashed line shows the sky coverage as a function of limiting point source sensitivity in the 0.5−2.0 keV band. The empirically estimated extended source sensitivity is shown with a solid line. The median point source sensitivity of the survey is 3.7 × 10^-15 erg s^-1 cm^-2, the median sensitivity for the extended sources 9.3 × 10^-15 erg s^-1 cm^-2 (vertical line).