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Astron. Astrophys. 361, 743-758 (2000)
Acknowledgements
The authors are grateful for the provision of data by the SOHO MDI consortium. SOHO is a project of international co-operation between ESA and NASA. JRC was supported by a PPARC Post-Doctoral Research Fellowship.
© European Southern Observatory (ESO) 2000
Online publication: October 2, 2000
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