...1997

Tables 6 to 9 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

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...^1,2

Present address: The Sanger Centre, Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SA, UK.

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...Observatory

The Royal Greenwich Observatory was closed on 31 October 1998; see Appendix A.

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