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Astron. Astrophys. 330, 764-772 (1998) AcknowledgementsWe are grateful to all experimental groups and to the director of WDC-A for Solar-Terrestrial Physics for helpful correspondence in providing these data. Thanks are also due to Mrs. Tatsi for technical help. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: January 16, 1998 ![]() |