Left: completeness of the joint Planck+SPT-SZ survey (red) compared to the completeness of individual Planck (black) and SPT-SZ (blue) surveys. The dashed, solid, and dotted-dashed line correspond to the 80, 50, and 20% completeness level, respectively. Right: predicted cluster counts in each redshift bin for a Planck Collaboration VI (2020) primary CMB cosmology in the SPT-SZ footprint. The Planck+SPT-SZ curve corresponds to the joint extraction, while the union curve corresponds to the union of the individual Planck and SPT-SZ catalogs. The mass bias factor (1 − b) was set to 0.63 in the right figure.