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Astron. Astrophys. 360, L21-L24 (2000)
Acknowledgements
We would like to thank Rachel Howe and Mike Thompson for many useful discussions regarding the helioseismic observations and for providing us with the data displayed in Fig. 1. EC is supported by a PPARC fellowship and RT benefited from PPARC UK Grant No. L39094.
© European Southern Observatory (ESO) 2000
Online publication: August 17, 2000
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