Distribution density plot of NeGIX gradients showing a sample of Swarm A–C data collected during their descending orbits. The period corresponds to the northern summer months (May to July) of 2019, during diurnal local time from 9:00 to 15:00. The 95th-percentile magnitudes of NeGIX_X_P95 (left panel) and NeGIX_Y_P95 (right panel) are plotted as functions of quasi-dipole latitude, with the color scale representing the occurrence (counts) of values. The bottom panels display histograms projecting the distribution of gradient values for both NeGIX components.