Top panel: mean profile (long red dashes) from all 14 000 random stacks and the 1σ (dashed), 2σ (dash-dotted), and 3σ (dotted) limits of the distribution of profiles. For illustration, the thin grey curves are the temperature profiles of just a few hundred stacks of 50 random positions. The blue solid curve is the result from the fiducial stacking of Gr08 voids. Every stacking here is carried out in the WMAP V CMB map, smoothed at 30.6′. Bottom panel: same legend as before for the photometry profiles. The results from the V (solid blue) and W (dashed blue) band are also shown. Similarly to Gr08, the signal from their voids stands out at more than 3σ on an angular scale of 4°.