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Figure 1


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(a) Sketch of the GOES observing GPS satellites; all visible GPS satellites are behind the Earth. (b) GPS satellite tracks from the point of view of the GOES during a single day; 0° on top is the North pole, the blue circle in the center is the Earth, the radial distance is the distance of the point of closest approach of the ray path between GPS and GOES to the Earth’s center.

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