  The CERES/Na45 experiment at CERN SPS measured transverse momentum spectra of
charged-pions in the range 1<pt<4GeV/c near mid-rapidity in 158 AGeV/c Pb-Au
collisions. The invariant transverse momentum spectra are exponential over the
entire observed range. The average inverse slope is 245+/- 5MeV/c, it shows a
2.4% increase with centrality of the collision over the 35% most central
fraction of the cross section. The pi-/pi+ ratio is constant at 1.028+/-0.005
over the pt interval measured.
