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- (2002)cite arxiv:astro-ph/0212375 Comment: 19 pages, revised following referee's report, and accepted by MNRAS. Higher resolution Figures, an animated versio...cite arxiv:astro-ph/0212375 Comment: 19 pages, revised following referee's report, and accepted by MNRAS. Higher resolution Figures, an animated version of Figure 12 and a colour version of Figure 22 are available from http://www.nottingham.ac.uk/~ppxeh/.


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