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Figure 12


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Median of TEC N-S gradient at 20 km (a) and 100 km (c) and of the model |Grad_Ne@20km| (b) and |Grad_Ne@100km| (d) from the equatorial model in the geographical sector (54°W, 17°–20°S) as a function of day and LT. The yellow solid lines indicate the sunrise and sunset times evaluated at 120 km. The considered time period is from 1 September 2013 to 30 March 2014.

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