Contribution of each Fourier mode K to the lensing estimator S/N. Four curves are drawn: SPT-SZ (blue triangles), Planck (red downward triangles), the sum of the two first curves (black dots) and the combination of both datasets (dashed green line). The three panels cover the range of ϕ(K) that are used, corresponding to the smallest (left), median (middle) and largest (right) cluster of our sample in term of angular diameter size.