Fig. 12
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Histogram of sky pixels illustrating the correlation between the log amplitude field, ρ, and the logarithmic DM (panel a) and the logarithmic square root EM (panel b) skies, respectively. The former is calculated from a Galactic thermal electron model (Yao et al. 2017), while the latter is inferred by the Planck survey from extinction-free microwave data (Planck Collaboration X 2016).
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