Astron. Astrophys. 362, 1151-1157 (2000)

Acknowledgements

VMN is grateful to Bernie Roberts and Leon Ofman for a number of insightful discussions, and to Tony Arber for the help with the numerical solution of the evolutionary equation. EV and DB acknowledge the support of the Belgian Federal Services of Scientific, Technical and Cultural Affairs (SSTC/DWTC). EV, DB and ER would like to thank Jean-Francois Hochedez for the many useful discussions. The authors are grateful to the referee, Markus Aschwanden, for help with the paper improvement.

© European Southern Observatory (ESO) 2000

Online publication: October 30, 2000
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