Shear modulus and viscosity profiles for the multilayer reference model Vreſ and homogeneous model considered here, shown as solid red and black lines, respectively. The dotted and dash-dotted red lines represent the two profiles V0.1 and V100 derived from the multilayer reference model with a viscosity multiplied by ×0.1 and ×100 times, respectively. The viscosity η is computed as in Dumoulin et al. (2017) using Eq. (8) of this work.