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Astron. Astrophys. 361, 734-742 (2000) AcknowledgementsHelp with the SIR code by Dr. L. Bellot Rubio and Dr. B. Ruiz Cobo is gratefully acknowledged. Dr. J.C. del Toro Iniesta carefully read the manuscript. Criticism by Dr. J. Sánchez Almeida on a previous estimate of the rms gradients is acknowledged. The ASP data used in this work is part of a collaboration with Dr. B.W. Lites and Dr. A. Skumanich from HAO/NCAR. This project was partly funded by the Spanish DGYCIT under project 95-0028-C. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: October 2, 2000 ![]() |