Evolution of the TS corresponding to the additional presence of a point-like emission at the centre of the ROIs as a function of the number of stacked galaxy clusters obtained from the whole sample (plain line), as well as for cool-core (star-dashed line) and non-cool-core (circle-dashed line) populations. The TS values are obtained for a power-law spectrum with photon index Γ_ph = 2.4 and galaxy cluster ordered by descending values of M₅₀₀/z².