  We have measured the cross section sigma(e+e- \to pi+pi-gamma) as a function
of the pi+pi- invariant mass, M_pipi, with the KLOE detector at DAPHNE
(W=m_phi=1.02GeV). The photon in the above process is due to Initial State
Radiation. Dividing by a theoretical radiator function we obtain the cross
section sigma(e+e- \to pi+pi-) for the mass range 0.37<M_pipi^2<0.93GeV^2. We
extract the pion form factor and the hadronic contribution to the muon anomaly,
a_mu.
