Fig. 3From: A harmonic spline magnetic main field model for Southern Africa combining ground and satellite data to describe the evolution of the South Atlantic Anomaly in this region between 2005 and 2010Comparison between SACFM-2 and CHAOS-6 at 2008.0 for 3 components X, Y and Z. Comparison of models SACFM-2 a and CHAOS-6 b at epoch 2008.0, their differences are shown in the third row c and last row d at 0.8 and 350Â km altitudes, respectively. The three components X, Y and Z are plotted in the first, second and third columns, respectively. The unit is nanoteslaBack to article page