Illustration of the procedure adopted to compute mean reflectance spectra. The SSO chosen as an example here is (1459) Magnya, which is a basaltic asteroid presenting a deep 950 nm-centred absorption band and a red-sloped spectrum. Left panel: one epoch reflectance spectrum is plotted. BP and RP data are blue and red respectively. Middle panel: all epoch reflectance spectra of Magnya are plotted. Right panel: data filtered out by our sigma-clipping procedure are shown in grey; the over-plotted black dots correspond to the final average reflectance spectrum sampled in the 16 bands.