Fig. 3
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Color ratio obtained from the vertical brightness profile of the IFP between 3 and 10 degrees with Eq. (8). The black lines are the orbit-by-orbit color ratios with their respective uncertainty (gray areas). The red solid curve is the average color ratio, and the red dashed lines are the 1σ boundary of its uncertainty. The data below 100 km were excluded due to poor S/N.
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