Upper panels: Distribution in richness $\widehat{\lambda }$ and SZe signal-to-noise ξ of the redMaPPer clusters matched by SPT, (color-coded by redshift; see color bar at right). We split this into three surveys with different SZe detection limits (the gray lines) and varying depth. Lower panels: Fraction of redMaPPer clusters confirmed by SPT in the three surveys as a function of richness (black points). The gray-shaded area shows the upper limit of the confirmation fraction due to false SPT detections.