Fig. 5

Maps of radial lithospheric field calculated at the Earth’s surface from coefficients of degrees \(16\le n \le 90\) taken from the field model derived from \(\varvec{\Gamma }^{(1)}\) (a) and \(\varvec{\Gamma }^{(2)}\) (b). For reference, the radial lithospheric field at the Earth’s surface from coefficients of degrees \(16\le n \le 90\) taken from MF7 (c) and CM5 (d) is also shown. Green lines indicate the boundaries of the major tectonic plates, whereas red lines locate the dip equator (\(0^\circ\) QD latitude) and \(\pm 55^\circ\) iso-QD latitudes