Fig. 2

Left plot shows differences \({~}_{i,j}{g_{n}^{m}}\) as defined in Eq. 2 between DGRF-2010 candidate models and their arithmetic mean model M as a function of the index of the spherical harmonic coefficient (running from \({g_{1}^{0}},{g_{1}^{1}},{h_{1}^{1}},{g_{2}^{0}},{h_{1}^{1}}\), etc. indexed 1,2,3,4,5, etc). The vertical line locates the zonal coefficient (m=0) for each SH degree n. Right plot shows the SH degree correlation _i,M ρ _n (Eq. 11) of DGRF-2010 candidate models with the arithmetic mean model M