Fig. 6From: The BGS candidate models for IGRF-13 with a retrospective analysis of IGRF-12 secular variation forecastsDifference in each magnetic component between the BGS candidate model for 2020.0 and IGRF-2020 (median of IGRF-13 candidates). Values of contours (grey lines) are marked on the colour scales, with a thicker line for the zero contourBack to article page