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Table 1 Number N of data points and Huber-weighted mean and rms misfits (in nT) for the ASM-V, VFM, and N-VFM parent models

From: A 2015 International Geomagnetic Reference Field (IGRF) candidate model based on Swarm’s experimental absolute magnetometer vector mode data

Residual statistics of parent models
  N ASM-V VFM N-VFM
mean rms mean rms mean rms
Alpha + Bravo F P 49,214 −0.27 4.81 +0.00 4.80 −0.01 4.80
F NP + B B 223,627 +0.04 2.30 +0.02 2.27 +0.01 2.27
  B r 139,292 −0.02 2.45 −0.06 1.76 −0.02 1.83
  B θ 139,292 −0.03 3.56 +0.06 3.18 +0.06 3.17
  B ϕ 139,292 −0.16 2.96 −0.13 2.61 −0.15 2.60
Alpha F P 24,294 −0.31 4.94 −0.05 4.93 −0.06 4.93
  F NP + B B 107,329 +0.08 2.32 −0.03 2.29 +0.06 2.29
  B r 65,169 +0.00 2.47 −0.05 1.77 +0.01 1.83
  B θ 65,169 −0.13 3.61 +0.14 3.19 +0.04 3.19
  B ϕ 65,169 −0.19 3.02 −0.15 2.62 −0.17 2.61
Bravo F P 24,920 −0.23 4.68 +0.05 4.67 +0.04 4.67
  F NP + B B 116,298 −0.01 2.28 +0.06 2.26 −0.03 2.25
  B r 74,123 −0.04 2.44 −0.07 1.74 −0.05 1.83
  B θ 74,123 +0.06 3.51 −0.01 3.18 +0.08 3.16
  B ϕ 74,123 −0.14 2.91 −0.12 2.60 −0.14 2.60
  1. F P refers to scalar data with (absolute) quasi-dipole latitude larger than 55° (recall that no vector data are selected at such latitudes); F NP refers to scalar data at other latitudes (selected whenever vector data are not selected); B B refers to the vector component along the main field direction; B r , B θ , and B ϕ refer to the geocentric components