S/N map of the matched-filtered 2 mm COSMOS map. Positive S/N values corresponding to cluster candidates are shown in blue, matching the colors in Figs. 7 and A.1, as expected for tSZ emission. The angular size of the applied matched filter is equal to the size of the NIKA2 beam at 2 mm (18.5″). The black contour shows the high-quality region discussed in Sect. 2.3. Cluster candidates are highlighted in black squares. Sixteen candidates are detected above a S/N threshold of 4 (see Sect. 3.3).