Example of standard deviation computation and icosahedron binning. The dark blue dots show the quasi-uniform spherical geodesic grid. The bright blue/cyan dot represents our example grid point with its associated bin shown as the orange hexagon linking it to its neighbour vertices (orange dots). The purple dashed lines represent Swarm satellite passes with purple squares marking the central location of the 20-s standard deviations of the magnetic field. The average of the points (green squares) that fall within this bin are counted. The coastal outline is shown for reference.