Fig. 9From: The BGS candidate models for IGRF-13 with a retrospective analysis of IGRF-12 secular variation forecastsSpatial median for each component of field differences between all IGRF-12 SV candidates and IGRF-13 SV for 2015–2020. Values of contours (grey lines) are marked on the colour scales, with a thicker line for the zero contourBack to article page