tokens: We thank the anonymous referee and R. Ulrich for constructive comments. We are grateful to X. Zhao for the spherical harmonic decomposition code, and A. A. Norton and B. McClintock for bringing the DPD catalog to our attention. This work is supported by NASA contract NAS5-02139 (HMI). The HMI data are courtesy of NASA and the SDO /HMI team. The SSN records are courtesy of WDC-SILSO, Royal Observatory of Belgium, Brussels. Facility: SDO
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