Fig. 6From: A secular variation candidate model for IGRF-13 based on Swarm data and ensemble inverse geodynamo modellingMauersberger–Lowes spectra of the secular variation of the IGRF-13 SV model, the IPGP candidate and their difference at Earth’s surface (thick solid lines). Also shown are the spectra of the differences between the IGRF-13 SV model and the 13 other candidates that were submitted in response to the IGRF call (grey dashed lines)Back to article page