Spectral energy distribution of the γ-ray emission in the region of Kes 17, as detected by Fermi-LAT. The orange line indicates the best fit to the data using the power-law model dN/dE = ϕ₀(E/E₀)^−Γ with (see text for details). The yellow shaded zone corresponds to the 1σ region of the spectral fit. The blue and red error bars represent statistical and systematic uncertainties in the spectral points, respectively.