Different segmentations applied on a subregion of the Polaris map at 250 μm. (a) Original map. (b) Gaussian map reconstructed from all spatial scales. (c) Coherent map reconstructed from all spatial frequencies. (d) Original map without the frequencies associated with the flattened and decreasing part of the Gaussian power spectrum related to the CIB (i.e. 0.9 ≲ k≲ 2.2 arcmin⁻¹). (e) Gaussianmap without frequencies 0.9 ≲ k ≲ 2.2 arcmin⁻¹. (f) Sum of the Gaussian frequencies 0.9 ≲ k ≲ 2.2 arcmin⁻¹ dominated by the CIB signal.