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Fig. 2

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Observations of Uranus with HST/STIS, using the G140L grating and 0.5″-wide slit separate emissions at the vibrational Raman branch around 1280 Å from other Uranus and geocorona emissions. The upper panel shows the spectral flux (averaged over the spatial y-axis) as a function of wavelength. The bottom panel shows the wavelength-integrated brightness in Rayleigh along the slit. The average emission on Uranus’ disc (light blue shading) is 25.5 R. An average background of 5.5 R was measured away from the disc in two regions (shaded grey) along the slit.

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