Top: spectrum of 67P dust coma (black) together with the solar spectrum used to compute the reflectance spectrum (red). The blue dotted line is the spectrum extracted over a 10′′ aperture. The solar spectrum has been shifted arbitrarily over the y-axis for better visibility. Bottom: relative reflectance spectrum of 67P (black), compared to the one measured with X-shooter in November 2014 (red; Snodgrass et al. 2016).