Modeled normalized spherical harmonic coefficients C₂₀ (black dots) and C₂₂ (green dots) vs. the measured values from Yang et al. (2019), as in Fig. 5, but for the scenarios where the core is denser than the mantle (the core shape is homothetic to the Phobos surface). Triangles represent the layering cases that agree well with the C₂₀ from Yang et al. (2019). The 1σ and 3σ error bars for the measured coefficients are shaded and crossed bands. Most of the modeled C₂₀ values are outside the 3σ band around the measured value, excluding these scenarios. The case marked by a triangle is shown in Table 4.