Fig. 1.
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Solar activity over time as measured by the total filling factor of active regions (see main text). The observation time for each of the atlases compared in this study are shown to illustrate the average level of activity. The atlases are KPN87, KPW11, LFC13, IAG16, PEP18, HARPS-N’s MA & QS atlases, and IAG23, respectively. No information is provided regarding the observing dates of the HRS23 atlas.
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