Values of the misfit , the number of data N, the spatial norms and (in mT2), the temporal norm and [in (μT yr−1)2], and the integrals (in mT) and (in nT yr−1) for several values of the default parameters dS and dT. In all cases the damping parameters are fixed at λS= 10−10 nT−2 and λT= 5 × 10−6 (nT/yr)−2.