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To investigate uncertainties in air shower simulations caused by the small-xregime, a model including leading-twist hard pQCD plus soft processes wasbuilt, which are separated by an energy dependent transverse momentum cut-off.We provide a fit of the cut-off to the total pp cross section for differentPDFs using the eikonal formalism and show that for modern PDF sets there isonly a small uncertainty in the mini-jet cross section, and hence in thefinal-state multiplicity and the number of produced muons.Comment: 4 pages, 2 figures, contribution to QM2005 proceedings, revised  version after referee comment

Uncertainties in Air Showers from Small- x pQCD Mini-Jets