Fig. 1
From: MMX geodesy investigations: science requirements and observation strategy
Moments of inertia differences between homogeneous and inhomogeneous Phobos. The inhomogeneity is assumed to be produced by water ice confined to the outer layer. Different line colors indicate different depths of the layer boundary (red: shallow, blue: deep). Different colors in the circle symbols (color bar below the figure) indicate the density of the outer layer