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The parton momentum density distributions in the proton are determined from anext-to-leading order QCD analysis of structure functions measured at HERA andby fixed target experiments. Also included are data on the difference of the upand down anti-quark distributions. The uncertainties in the parton densities,structure functions and related cross sections are estimated from theexperimental errors and those on the input parameters of the fit. Several QCDpredictions obtained from this analysis are calculated and compared to data.The parton densites including the full error information is made available on acomputer readable file.Comment: Latex source, 14 pages, 3 tables, 15 figure

A QCD analysis of HERA and fixed target structure function data