Illustration of the data and noiseless, but reconvolved, signal responses of the reconstructions. Panel a) shows the data from a mock observation of a 32 × 32 arcmin² patch of the sky with a resolution of 0.1 arcmin corresponding to a total of 102 400 pixels. The data had been convolved with a Gaussian-like PSF (FWHM ≈ 0.2 arcmin= 2 pixels, finite support of 1.1 arcmin= 11 pixels) and masked because of an uneven exposure. Panel b) shows the centered convolution kernel. Panel c) shows the exposure mask. The bottom panels show the reconvolved signal response R⟨ρ⟩ of a reconstruction using a different approach each, namely d) MAP-δ, e) MAP-, and f) Gibbs. All reconstructions shown here and in the following figures used the same model parameters: α = 1, q = 10^-12, σ = 10, , and η = 10^-4.