Top: best fit (red) to the spectra of the Themis family members (black) using a Rayleigh scattering model. The spectrum of asteroid (468) Lina is well-matched by the spectrum of the hydrous IDP W7068A28MIR (blue; Merouane et al. 2014; see discussion in Sect. 4). Bottom: mass absorption coefficients of the end members used in the fitting procedure. Diopside (dotted line), forsterite, and fayalite were scaled down to 80%, 40%, and 50%, respectively.