Results for surface-based data available within a cap of semi-opening angle 20° and local spectra for the same spherical cap. Maps center and ranges are as in Fig. 4. Black dashed circle on maps indicates the region of data availability as well as the region for local spectral calculation. Maps show the radial component B_r on the planet’s surface (r = 3393.5 km) of the (a) average local model and (b) difference between the model of Langlais et al. (2019) and the average local model from panel (a). (c) Local Mauersberger–Lowes power spectrum of each local model (gray lines) and localized spectrum (dotted line) from the model of Langlais et al. (2019). (d) Ratio between the local spectra of the local models and the localized spectrum of Langlais et al. (2019).