Fig. 2From: The global geomagnetic field over the historical era: what can we learn from ship-log declinations?Dipole (top) and non-dipole (bottom) energy at the core–mantle boundary. For ArchKalmag14k.r and the HistKalmag models, 100 samples from the posterior are drawn transparently in the background to illustrate the uncertainties. The thick lines give the ensemble mean, while the dashed lines represent the energy calculated from the mean model directlyBack to article page