Left panel: Graphical representation of all 2D voids with their preliminary radii of each threshold produced by the same map shown in Fig. 2, centered at the S/N-weighted centroids of the connected regions. Right panel: Same as the left panel, but with voids centered at the local minima of the connected regions. In both, each void of a given threshold is represented with the colored area of the same color, this color varies depending on the S/N threshold as shown in the colorbar.