Deep inelastic cross-section measurements at large y with the ZEUS detector at HERA

The reduced cross sections for $e^{+}p$ deep inelastic scattering have been measured with the ZEUS detector at HERA at three different center-of-mass energies, 318, 251 and 225 GeV. The cross sections, measured double differentially in Bjorken x and the virtuality, $Q^{2}$ , were obtained in the region 0$.13\leq y\leq 0.75$, where y denotes the inelasticity and $5\leq Q^{2}\leq 110 GeV^{2}$. The proton structure functions $F_{2}$ and $F_{L}$ were extracted from the measured cross sections.