Affiliation: | 1. School of Physics and Astronomy, U. Birmingham, Edgbaston, Birmingham, B15 2TT, UK 2. Institute of Advanced Study, U. Warwick, Millburn House, Millburn Hill Road, University of Warwick Science Park, Coventry, CV4 7HS, UK 3. National Solar Observatory, 950 N. Cherry Ave., Tucson, AZ, 85719, USA 4. Kiepenheuer-Institut für Sonnenphysik, Sch?neck str. 6, 79104, Freiburg, Germany 5. Institute for Astronomy, U. Hawaii, 34 ’ōhi’a Kū St., Pukalani, HI, 96768-8288, USA
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