Spectrum of a single gamma-ray point source recovered using the multichannel MS-VSTS denoising algorithm. Top: single gamma-ray source from simulated Fermi data integrated along the energy axis (left: simulated source; middle: noisy source; right: denoised source). Bottom: spectrum of the center of the point source: intensity as a function of the energy band with 14 energy bands between 50 MeV and 50 GeV (black: true simulated spectrum; cyan: restored spectrum from our denoising algorithm.