Another model notes that "Dawn" data is consistent with a partial differentiation of Ceres into a volatile-rich crust and a denser mantle of hydrated silicates. A range of densities for the crust and mantle can be calculated from the types of meteorite thought to have impacted Ceres. With CI-class meteorites (density 2.46 g/cm3), the crust would be approximately 70 km thick and have a density of 1.68 g/cm3; with CM-class meteorites (density 2.9 g/cm3), the crust would be approximately 190 km thick and have a density of 1.9 g/cm3. Best-fit from admittance modeling yields a crust approximately 40 km thick with a density of approximately 1.25 g/cm3, and a mantle/core density of approximately 2.4 g/cm3.