Erratum: Submillimeter lines from circumstellar disks around pre-main sequence stars G.-J. van Zadelhoff, E. F. van Dishoeck, W.-F. Thi and G. A. Blake A&A, 379 3 (2001) 924 Published online: 15 December 2001 DOI: 10.1051/0004-6361:20011496