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Table 2 Root-mean-square vector field differences \(_{i,j}T\) in units of nT between DGRF-2015 candidate models and also between candidates and the arithmetic mean reference models M, median reference model \(M_{\text{med}}\) and robust Huber-weighted in the rightmost columns

From: Evaluation of candidate models for the 13th generation International Geomagnetic Reference Field

\(_{i,j}T\)/nT B CM CU D G IP IS IZ N P S M \(M_{\text{med}}\) robust
B 0.00 4.51 2.53 2.17 2.68 2.63 8.53 6.54 4.43 2.53 6.12 2.25 2.02 1.97
CM 4.51 0.00 3.77 3.21 4.69 3.13 8.87 7.44 6.18 3.85 6.09 3.45 3.22 3.37
CU 2.53 3.77 0.00 1.70 3.13 2.05 8.23 6.83 4.26 2.71 5.84 1.96 1.74 1.75
D 2.17 3.21 1.70 0.00 2.77 1.15 8.30 6.48 4.41 1.80 5.87 1.52 0.93 1.11
G 2.68 4.69 3.13 2.77 0.00 3.12 8.27 6.17 4.22 2.36 5.71 2.12 2.31 2.11
IP 2.63 3.13 2.05 1.15 3.12 0.00 8.19 6.50 4.88 2.08 5.82 1.76 1.25 1.47
IS 8.53 8.87 8.23 8.30 8.27 8.19 0.00 11.39 9.06 8.01 10.04 7.57 8.06 7.89
IZ 6.54 7.44 6.83 6.48 6.17 6.50 11.39 0.00 7.87 6.43 8.09 6.01 6.23 6.14
N 4.43 6.18 4.26 4.41 4.22 4.88 9.06 7.87 0.00 4.39 6.96 4.04 4.32 4.07
P 2.53 3.85 2.71 1.80 2.36 2.08 8.01 6.43 4.39 0.00 5.84 1.69 1.58 1.46
S 6.12 6.09 5.84 5.87 5.71 5.82 10.04 8.09 6.96 5.84 0.00 5.12 5.42 5.32
Mean Diff 4.27 5.18 4.11 3.79 4.31 3.96 8.89 7.37 5.66 4.00 6.64 3.41 3.37 3.33
  1. The bottom row is the simple arithmetic mean of the columns