Dipole moment predicted by spherical harmonic field models CALS10k.1b (red), CALS3k.4 (blue), CALS3k.3 (light blue), CALS7K.2 (grey) and by the archeomagnetic VADM reconstructions by Knudsen et al. (2008) (black) and Genevey et al. (2008) (brown) with uncertainty estimates (dashed lines and error bars) as provided by the authors, see text for details. Uncertainty estimates for CALS3k.3 and CALS3k.4, which are similar to those for CALS10k.1b, have been omitted to avoid cluttering the figure.