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Astron. Astrophys. 346, 633-640 (1999)

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Acknowledgements

The data used stem from the MDI instrument on board of SOHO. SOHO is a project of international cooperation between ESA and NASA. For support to obtain the data and for additional information we thank R.S. Bogart, J.T. Hoeksema, N. Hurlburt, P.H. Scherrer, and Z.A. Frank. For discussions we thank our colleagues, especially M. Kiefer.

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© European Southern Observatory (ESO) 1999

Online publication: May 21, 1999
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