Examples of pixel-like modes (the parenthesis in the title reports the corresponding eigenvalue divided by the largest eigenvalue). These modes involve mainly a “ring” composed of a very limited number of pixels (see the first row). In the second row, the same eigenvectors are displayed with a color scale squeezed by roughly two orders of magnitude, emphasizing structures inside and outside of the ring. Outside of the ring the structures quickly fade away. Also moving inwards the structures decrease their amplitude. However, compared to the outward structure, their typical length is much larger and, most important, they do not completely disappear: they have a relevant amplitude in the whole inner region. We emphasize that the “horizontal” structures represent the correlations induced by the ground template filtering.