Fig. 4
Top panel: histograms of the electron density in the Galactic disk at different times from 400 through 500 Myr at every 20 Myr. Bottom panel: time averaged volume histograms of the electron density in the Galactic disk for different temperature regimes and total density (brown) calculated between 400 and 500 Myr using 51 snapshots with a time interval of 1 Myr.
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