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FGCluster runs spectral clustering onto Healpix maps for parametric foreground removal, using a map encoding the feature to cluster as inputs. Pixel similarity is given by the geometrical affinity of each pixel in the sphere. FGCluster can also take an uncertainty map as an input, in which case the adjacency is modified in such a way that the pixel similarity accounts also for the statistical significance given by the pixel values in a map and the uncertainties.