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2000PhyS...61..717D Author Comment Author comment for 2000PhyS...61..717D:

The full text for this article is available from the author's home institution, at the URL ftp://ftp.astro.su.se/pub/dorch/Dorch2000a.ps.gz Author comment submitted 06-Jun-2000 by S. Bertil Dorch (dorch@astro.su.se)