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Fig. 6

image

Two-step process used to measure Doppler shifts. Top panel: the reference spectrum is the average of 400 spectra obtained on the Sun, while spectrum of Venus corresponds to a single location on Venus disk. Bottom panel: same spectra after shifting the reference spectrum at the same location of Venus and after normalizing them. The wavelength ranges indicated bytwo arrows and vertical dotted lines indicate the selected areas where cross-correlation is applied (see text). Spectra were obtained on September 14, 2009.

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