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Astron. Astrophys. 332, 1075-1081 (1998) AcknowledgementsThe authors thank Aad van Ballegooijen and Pascal Démoulin for useful discussions and the referee for helpful comments. TN acknowledges support by a PPARC Advanced Fellowship. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: March 30, 1998 ![]() |