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Astron. Astrophys. 341, 371-384 (1999) AcknowledgementsWe thank Simon Folkes, Ofer Lahav and Avi Naim for valuable discussions and suggestions. Ben Kröse is acknowledged for a stimulating discussion, and Richard Arnold for triggering our interest in Artificial Neural Networks. We thank the ENACS team for allowing us to use the data, and Jaime Perea in particular for comments about the spectral reduction. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: December 4, 1998 ![]() |