The cross section and the proton structure function \documentclass[12pt]{minimal}
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\begin{document}$F_2$\end{document} for neutral current deep inelastic \documentclass[12pt]{minimal}
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\begin{document}$e^+p$\end{document} scattering have been measured with the ZEUS detector at HERA using an integrated luminosity of 30 pb\documentclass[12pt]{minimal}
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\begin{document}$^{-1}$\end{document}. The data were collected in 1996 and 1997 at a centre-of-mass energy of 300 GeV. They cover the kinematic range \documentclass[12pt]{minimal}
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\begin{document}$2.7 < Q^2 < 30000$\end{document} GeV\documentclass[12pt]{minimal}
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\begin{document}$^2$\end{document} and \documentclass[12pt]{minimal}
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\begin{document}$6\cdot 10^{-5} < x < 0.65$\end{document}. The variation of \documentclass[12pt]{minimal}
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\begin{document}$F_2$\end{document} with x and \documentclass[12pt]{minimal}
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\begin{document}$Q^2$\end{document} is well described by next-to-leading-order perturbative QCD as implemented in the DGLAP evolution equations.