This graphic has three parts. To the left, an image of the visible surface of a planet is divided into two halves that are shown in two different wavelengths. This results in a blue-colored and a red-colored half-circle, joined together. In the middle there is a digram where intensity is drawn as a function of velocity, resulting in a line profile, that is, a sharp decline and rise of the curve. To the right, the image shows a partial view of planet Jupiter, one of Jupiters moons, and a spacecraft in the Jupiter system.
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