- ...1991
- based on data collected at the European Southern
Observatory, La Silla, Chile.
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- ...1991
- Tables and the complete data set are also available in electronic form
at the CDS via anonymous ftp to cdsarc.u-strasbg.fr or via
http://cdsweb.u-strasbg.fr/Abstract.html
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- ...levels
- Figure 1 to 24 are
only available on the on-line version of A&A at http://www.ed-phys.fr
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