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Astron. Astrophys. 332, 149-154 (1998) AcknowledgementsThanks are due to Josep-Maria Paredes and Josep Marti for having provided the code of the PDM and for their helpful suggestions; to Walter Alef, Klaus Reif and Luca Moscadelli for many interesting discussions. We would like to thank the unknown referee whose comments greatly improved the presentation of the paper. Maria Massi acknowledges support for her research by the European Union under contract FMGECT950012. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: March 10, 1998 ![]() |