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Astron. Astrophys. 330, 1136-1144 (1998)

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Acknowledgements

We wish to thank Mrs M. Lafon for her technical assistance during this work. The photometric measurements were made with the "M.A.M.A." microdensitometer of the Institut National des Sciences de L'Univers in Paris. This work was supported by the Centre National de la Recherche Scientifique (C.N.R.S.) and by the Groupe de Recherche du CNRS "magnétodynamique solaire et stellaire". We would like also to thank Dr. R. Muller for many fruitful discussions. The authors wish to express their gratitude to L. November for providing his Local Correlation Tracking algorithm and for his valuable suggestions on using his software. We would like to give special thanks to R.A. Shine and Z. Frank (Lockheed, Palo Alto)for their assistance in providing LCT comparisons between the different techniques; to Drs P.N. Brandt (KIS institut, Germany) and G.W. Simon (Sacramento Peak, USA) for their comments and recommendations concerning the use of LCT technique; and to the referee for his helpful suggestions on how to clarify the text.

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© European Southern Observatory (ESO) 1998

Online publication: January 27, 1998
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