Fig. 11
Comparison of 
between MDI (blue) and HMI (red) using data in the periods when SOHO spacecraft was “upright” (upper) and “upside down” (lower). The data are averaged over the travel-distance range 20.4°–34.2° as in the third panel of Fig. 8. Unlike in the non-flipping periods, the discrepancies between the two curves become noticeable in the flipping periods.
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