Deviation of the kurtosis of the signed-intensity as a function of Gμ/c², normalised to the standard deviation of CMB and noise simulations: ΔK/σ = (K(R,Gμ/c²) − K(R,Gμ/c² = 0)) /σ. The left panel shows results for the 1GD wavelet and the right shows the 2GD wavelet. Each curve corresponds to a wavelet scale, R (arcmin), included in the analysis. The final sensitivity of the method is determined by combining the two wavelets and all the scales.