RMS spectrum topography for small satellites of Saturn. The black curve with points represents the spectrum, the solid-black curve is the uncertainty deduced from the least-square fit of the spherical harmonics to the shape models. The dashed-black curve corresponds to the fit of the Vening Meinez-Ermakov laws with the values of the parameters (A, α_R, α_ρ, α_n) for all satellites. The gray filled area give the range of values provided in Ermakov et al. (2018).