Fig. 3
From: A new view on the solar wind interaction with the Moon
The energy spectrum of backscattered ENAs observed by SARA/CENA along with the fitted curves. Data are averaged over 3 orbits during 17–18 July 2009. CENA employed different energy settings and the data for the energy settings 1–3 are indicated. The fits for the Thompson–Sigmund law (light blue line), the bi-power law (blue line), and the Maxwell–Boltzmann distribution (red line) are shown. The green dashed and the green dotted curves show the fits for the Maxwell–Boltzmann distribution only for the data corresponding to the energy setting 2 (38–652 eV) and the Maxwell–Boltzmann distribution convolved with relatively wide energy resolution and response functions, respectively [from Futaana et al. (2012)]