Mass limit illustrated for SZ detections by MMF3 algorithm. Upper left: average mass limit computed from the average noise over the sky. Upper right: same for the deep survey zone corresponding to 2.7% sky coverage centred at the Ecliptic polar regions. Lower left: same for the medium-deep survey area covering 41.3% of the sky. Lower right: same for the shallow-survey area covering 56% of the sky. In each panel, only detections in the corresponding areas are plotted. The lines dotted, dashed and solid lines show the Planck mass limit at 80, 50 and 20% completeness, respectively.