What is controlling the reflectance spectra (0.35-150 µm) of hydrated (and dehydrated) carbonaceous chondrites?

When comparing the spectra obtained with Cg and Cgh spectral end member, it is found that the band depth determined for hydrated chondrites (0.7 and 2.3 µm) are always higher than calculated for these spectral endmembers. If one considers only asteroids with unambiguous hydration detection, band depth at 0.7 µm is of similar value to those measured for hydrated carbonaceous chondrites.