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Based on the UrQMD transport model, the transverse momentum and the rapiditydependence of the Hanbury-Brown-Twiss (HBT) radii $R_L$, $R_O$, $R_S$ as wellas the cross term $R_{OL}$ at SPS energies are investigated and compared withthe experimental NA49 and CERES data. The rapidity dependence of the $R_L$,$R_O$, $R_S$ is weak while the $R_{OL}$ is significantly increased at largerapidities and small transverse momenta. The HBT "life-time" issue (thephenomenon that the calculated $\sqrt{R_O^{2}-R_S^{2}}$ value is larger thanthe correspondingly extracted experimental data) is also present at SPSenergies.Comment: 17 pages, 11 figure

Transport model analysis of the transverse momentum and rapidity dependence of pion interferometry at SPS energies