Top panel: signal-to-noise ratio (as defined in Eq. (1)) of the temperature (dashed blue) and photometry (solid blue) profiles of our fiducial stack in WMAP V CMB map. A ~3.3σ signal stands out in the photometry at a scale of 3.74°. Bottom panel: distribution of photometry values for an aperture angle of 3.74°, from 14 000 stacks of 50 random positions. The mean, 1, 2, and 3σ values are marked the same way as in Fig. 7. The blue long-dashed line shows the value obtained from the fiducial stacking. The best fitting Gaussian (red solid curved) follows closely the distribution.