Reconstruction, i.e. map and power spectra from mock data, created according to Appendix A. For clarity, Figure A.1a  only shows a snapshot of the events between 32.8 s ≲ t ≲ 33 s. In addition to the raw photon counts, the black line shows the original signal s , as well as the reconstruction in red, including its uncertainty. Figure A.1b shows the reconstructed power spectra as well as its uncertainty, as in Fig. A.1a, using a smoothness-enforcing prior with σ_sm = 10⁴.  Fig. A.1c, shows a reconstructed power spectrum with a weaker smoothness-enforcing prior with σ_sm = 10⁵.