Fig. 1

Top panel: Joule heating at t = 2000 s as a function of height for the LRM. Bottom panel: Joule heating
at t = 600 s as a function of height for the HRM. In both panels the dark regions stand for high concentration of data points, gray regions for low concentration, and white for the absence of data points. The white dashed lines give the average ηJ2 as a function of height.
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