Panel a: CMB as derived by the Planck Collaboration IV (2020), panels b–d: correlations of the posterior mean of feature C with (panel b) the CMB, mutual information I = 0.88 and Pearson correlation coefficient ρ = 0.70, (panel c) feature A, I = 0.29 and ρ = 0.01, and (panel d) feature B, I = 0.20 and ρ = 0.01. The histograms and mutual information were compiled as described in Fig. 4. Bright colors in the histograms denote a high number of counts.