Fig. 4From: The Mag.num core field model as a parent for IGRF-13, and the recent evolution of the South Atlantic AnomalyHistograms of the residuals for the three components X, Y, Z at low and mid latitudes in geocentric solar ecliptic coordinates for Swarm satellites Alpha (A, left), Bravo (B, middle) and Charlie (C, right) for the entire time of Mag.num. A Gaussian distribution corresponding to the calculated standard deviation (sd) of each distribution is indicated as black line. The distribution’s mean, skewness and excess kurtosis are given in the top right of each panelBack to article page