Temporal evolution and empirical distribution of the intensities within a patch: (a)–(b) in patches extracted at a location θ_k close to the coronagraph; (c)–(d) in patches extracted at a location θ_k farther from the coronagraph; (e) in all the patches from the field of view. Rows a and c: values within the patches for ten specific frames: t₁, t₃, t₈, t₁₃, t₁₄, t₂₅, t₄₀, t₅₄, t₆₃ and t₆₉. Rows b, d, and e: empirical histograms computed over all frames t₁ to t₆₉ and, in dashed line, a standard Gaussian. The first column corresponds to centered patches . The second column corresponds to centered patches, after whitening the spatial correlations. The last column corresponds to centered patches that have been both whitened for the spatial correlations and equalized with the temporal scaling factors.