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2004PhDT..........V Author Comment Author comment for 2004PhDT..........V:

The full text of this article is electronically available from the author's home institution the URL: http://www.astro.uu.nl/~jleeuwen/phd_thesis

Author comment submitted on 23 June, 2004 by Joeri vn Leeuwen (a.g.j.vanleeuwen@astro.uu.nl)