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Astron. Astrophys. 332, 459-478 (1998) AcknowledgementsWe would like to thank Fionn Murtagh, Eric Slezak, Albert Bijaoui, Florence Durret, Gary Mamon, René Méndez, Patrick Petitjean and Catarina Lobo for useful discussions. GG is fully supported by a fellowship from the French Ministry of Foreign Affairs. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: March 23, 1998 ![]() |