X-ray emissions from the surface of Mercury induced from high-energy electron precipitation. Panel a: maps (same format as Fig. 1) showing the total X-ray photon flux emitted from the surface in our two runs, as computed in Eq. (2). Panel b: INTENSITY of the different X-ray emission lines considered in this study. The intensity of these lines corresponds to the surface integral of the X-ray photon flux F_XRFs in Eq. (2). To better visualize the lines, a Gaussian profile with a width of 5 eV is used.