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Astron. Astrophys. 337, 105-112 (1998) AcknowledgementsL.O. acknowledges a partial support by NASA grant NAG5-7065 and a support by the Center for Earth Observing and Space Research, GMU. A.F. is thankful to Dr. O.V. Khoruzhii for helpful discussions. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: August 6, 1998 ![]() |