Table 1 Huber-weighted rms misfit (in nT) for various model parameterisations. \(N_\text {para}\) is the number of model parameters
# | Parameterisation | \(N_\text {para}\) | FGM1 | FGM2 | FGM3 |
|---|---|---|---|---|---|
1 | Weak temporal regularisation, all common parameters | 1284 | 6.43 | 7.23 | 6.72 |
2 | Same, no T dependence | 1278 | 6.57 | 7.23 | 6.80 |
3 | Same, no SA and Batt current dependence | 1275 | 6.51 | 7.30 | 6.80 |
4 | Same, no MTQ current dependence | 1275 | 6.81 | 7.60 | 7.13 |
5 | Same, no quadratic and cubic terms | 1236 | 7.20 | 7.78 | 7.30 |
6 | Same, no common parameters | 1212 | 7.85 | 8.32 | 7.81 |
7 | No temporal regularisation, all common parameters | 1284 | 6.39 | 7.07 | 6.67 |
8 | No temporal regularisation, no common parameters | 1212 | 7.75 | 8.18 | 7.71 |