Astron. Astrophys. 324, 344-356 (1997)

Acknowledgements

I am grateful to Christoph Keller of the National Solar Observatory, Tucson, for his support and collaboration on the observing program, and to the engineering group at ETH Zurich (Peter Povel, Peter Steiner, Urs Egger, Frieder Aebersold), who built the ZIMPOL system and provided the technical support. It is also a pleasure to thank Veronique Bommier and Marianne Faurobert-Scholl for clarifying discussions and helpful suggestions.

© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998

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