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We update the theoretical predictions for the t-tbar production cross-sectionat the Tevatron, taking into account the most recent determinations ofsystematic uncertainties in the extraction of the proton parton densities.Comment: 12 pages, 1 figure, Late

The tbar-t cross-section at 1.8 and 1.96 TeV: a study of the systematics due to parton densities and scale dependence