Example of a UVS spectrum showing the reflected solar continuum and the solar reference spectrum we used. The UVS spectrum (in red) was extracted from the spectral cube within the yellow polygon shown in Fig. 1, centered at longitude −30^° and latitude 40^°. The incident solar flux spectrum (in blue), originally measured at 1 AU and already representative of minimum solar activity (Curdt et al. 2001, 2004), was only rescaled to the heliocentric distance of ∼ 5.2 AU, corresponding to the separation of the Sun and Ganymede.