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Table 1 Parameters used in data weighting

From: The Mag.num core field model as a parent for IGRF-13, and the recent evolution of the South Atlantic Anomaly

  Sat Obs
LM HL LM HL
A B C   A B C    
  \(\sigma \)   k a   \(\sigma \)   k a \(\sigma \) k a \(\sigma \) k a
X 3.4 3.4 3.4 1.1 1.0 11.0 11.0 11.0 0.65 0.4 3.9 1.0 0.6 8.4 0.65 0.4
Y 3.0 3.0 3.0 1.1 1.0 11.0 10.0 9.0 0.65 0.4 3.9 1.0 0.6 8.0 0.65 0.4
Z 3.0 3.5 3.5 3.1 1.0 8.0 8.0 8.5 0.85 0.4 6.0 1.0 0.6 11.3 0.70 0.3
  1. Sat and Obs stand for satellite and observatory data, LM indicates the low- and mid-latitude subset and HL the high-latitude subset (see "Satellite data selection" section). Parameters k and a refer to the applied modified Huber norm for the X, Y and Z component data (Eq. 11). The standard deviations \(\sigma \) (in nT) for the satellite data are given separately for Swarm satellites A, B and C
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