Unmatched fraction of redMaPPer objects as a function of redshift bins. We show as black points the empirical estimate for the fraction of redMaPPer  objects not detected by SPT in redshift panels (columns) and richness bins. We show the posterior predictive distribution of the fraction of unmatched objects in the best-fit model (prj++, red), and the worst-fit model (plain, gray). The filled area encompasses the 16th and 84th percentile.