Results for 30% equal area random subselection. The maps are centered at longitude 160°W, latitude 69°S and are shown out to an angular distance of 45°. Black (or grey) dashed circle indicates the region of data availability (semi-opening angle 30°) and black dotted circle indicates the region for local spectral calculation. Maps show the radial component B_r evaluated on the planet’s surface (r = 3393.5 km) of the (a) average local model, (b) local model standard deviation, (c) ‘true’ global model (Langlais et al. 2019), and (d) difference (c) − (a). (e) Local Mauersberger–Lowes power spectrum of each local model (grey lines) and localized spectrum (dotted line) from the model of Langlais et al. (2019). (f) Ratio between the local spectra of the local models and the localized spectrum of Langlais et al. (2019).