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Figure 7

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(Left) Mean energy map (in eV) and (right) energy flux map (in erg·cm−2·s−1), resulting from the optimization method applied to the VER measurements for dataset 1, with a Maxwellian energy distribution. The white pixels correspond to the areas where the optimization is not feasible because the energy flux is less than 0.1 erg·cm−2·s−1. The geographic coordinates here correspond, arbitrarily, to the ones at a 100 km altitude.

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