Fig. 10From: Evaluation of candidate models for the 13th generation International Geomagnetic Reference FieldAnnual average differences (in nT/year) on the reference sphere \(r=a\) between the vertical field (\({\text{d}}B_z/{\text{d}}t\)) of the SV-2020-2025 candidates and the robust Huber model over 2020.0 to 2025.0Back to article page