Power spectra of the input and output maps for the component separation applied to Herschel SPIRE maps at 250 μm. Top: beam-corrected power spectrum of d_S, beam-corrected power spectrum of and its power-law fit. Bottom: ratio with the power-law fit. The colored bands represent ±1σ error-bars. The component separation extends the scale range where the dust power spectrum is found to have a power-law shape by a factor of 6.