Expected signal-to-noise ratio of multipolar moment spectra that one could obtain by stacking the total number of galaxy clusters N_cluster(z,M), that will be uncovered in the future Euclid survey (Sartoris et al. 2016). Red and blue curves represent the signal-to-noise ratio for the annuli R₁ ∈ [ 0.25 − 0.5 ] R_vir and R₄ ∈ [ 1 − 4 ] R_vir, respectively. Three different ranges of redshift are considered (~ 0.3, ~ 0.6 and ~ 0.9 from left to right), together with four fiducial cluster mass intervals (M₄,···M₁, from top to bottom).