Fig. 1From: COV-OBS.x2: 180 years of geomagnetic field evolution from ground-based and satellite observationsHistogram of observation errors \({\sigma ^{obs}_{GO}}\) and \({\sigma ^{obs}_{VO}}\) for GO and VO datasets, separated by spatial components. The dashed line represents the value of modeling error \({\sigma ^{mod}_{VO}}\) (see text for details). The observation errors for F were derived from these observation errors (see text)Back to article page