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Fig. 2


a) Ratio of the magnetogram signal registered by HMI and by MDI, BlHMI/ ⟨BlMDI as a function of BlMDI within 68 partially overlapping intervals of μ (the boundary of ten of which are annotated). Also illustrated is the same from the comparison between b) KPSPM and rescaled MDI magnetograms, and c) KP512 and rescaled KPSPM magnetograms. The vertical dashed lines at 100 G mark the threshold below which the points are excluded from the surface fitting to these data due to the influence of magnetogram noise (see text).

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