Fig. 7

Left: energy spectra at the Earth’s surface of the mean (continuous lines), the standard deviations (dashed lines), and the prior standard deviation (dash dotted line) for the Kalmag lithospheric model (black lines) and the FR model (blue lines). Dots represent the spectra of the difference between the Kalmag model and the WDMAM model by Lesur et al. (2016) (red), the LCS-1 model by Olsen et al. (2017) (green), and the FR model (blue). Right: degree correlation \(\rho _{\ell }\) between the Kalmag lithospheric field model and the WDMAM model (red lines), and the LCS-1 model (green lines)