Figure 3From: The BGS magnetic field candidate models for the 12th generation IGRFApproximate ‘weight’ of data in model. The ‘weight’ is computed from the sum of the inverse of the datum variances over 0.1-year intervals from satellites (Ørsted, CHAMP, and Swarm) and observatories. The ‘weight’ is normalised to the mean of the observatory weights over all 0.1-year intervals (=1).Back to article page