Fig. 4.
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Integrated 273 keV/nucleon daily oxygen fluences from Solar Orbiter (red) and ACE (green) for semi-quiet periods during the Solar Orbiter mission to date. The dashed black lines show the effect of raising or lowering the Solar Orbiter semi-quiet threshold by 20% (see the text for details). Right axis: heliocentric distance of Solar Orbiter (blue). Asterisks mark aphelia, when Solar Orbiter was in the vicinity of Earth.
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