Illustration of the three SZ quality grades as defined in Sect. 2. From left to right the three quality cases are: Q_SZ = A,B,C. The top row shows a 100′ × 100′ SZ map with a spatial resolution of 10′, centred on the candidate position, derived using the MILCA reconstruction method (Hurier et al. 2010). The colour table is identical for all clusters, with the Compton y parameter spanning the range  [ − 3 × 10^-6,1 × 10^-5] . The bottom row shows the associated SZ spectrum from aperture photometry measurements within R₅₀₀ (see text for details). The red line is the SZ spectrum normalised to the Y₅₀₀ value obtained from MMF blind detection.