Fig. 3From: A regional geomagnetic field model over Southern Africa derived with harmonic splines from Swarm satellite and ground-based data recorded between 2014 and 2019The Z (first row) and F (second row) maps showing SACFM-3 (first column) and CHAOS-6- × 9 (second column) and their differences (third column) at 2019.0 epoch and 0 km altitudeBack to article page