Projection of mineralogical parameters derived from seven spectra of the Didymos system. (a) Projection in the Fa vs. ol/(ol + px) space. (b) Projection in the Fs vs. ol/(ol + px) space. The mean values of these parameters are also shown, with error bars representing the standard deviations of the seven individual estimates derived from the seven spectra. The solid-line boxes in the figure represent the ranges of measured mineralogical parameters for the three subtypes (Brearley & Jones 1998; Dunn et al. 2010b), while the dashed-line boxes denote the ranges considering the RMSE values given by the calibration equations, with RMSEs of 0.035 for ol/(ol + px), 1.60 for Fa, and 1.26 for Fs.