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Fig. 3


Example of spectral images obtained with THEMIS in 2008 while scanning Venus. Color scale is inverted, i.e., dark is bright and white is faint. The three spectral ranges are centered on Mg, Fe, and Na Fraunhofer lines in the mid-visible domain. The 2D image is a zoom of the actual image where the dark area corresponds to Venus. The Fraunhofer lines are the vertical white structures. Since this spectra were taken during daytime, the absorption lines are visible both on Venus and the Earth sky. For all of the deepest lines, we clearly distinguish the Doppler shift in between Venus and Earth atmosphere. In these figures, the slit was positioned parallel to Venus’ equator close to the sub-Earth meridian. The black line, corresponding to the y-axis on the right side, is the Venus spectrum at about zero latitude.

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