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Final state radiation in the process $e^+e^-\to\pi^+\pi^-$ is considered forthe cuts used in the analysis of KLOE data at large angles. By means of a MonteCarlo event generator FEVA, effects of non-pointlike behaviour of pions areestimated in the framework of Resonance Perturbation Theory. An additionalcomplication related with the $\phi$ meson intermediate state is taken intoaccount and the corresponding contributions (the direct decay$\phi\to\pi^+\pi^-\gamma$ and the double resonance decay$\phi\to\rho^\pm\pi^\mp\to\pi^+\pi^-\gamma$) are added to FEVA. A method totest effects of non-pointlike behaviour of pions in a model-independent way isproposed.

Final state radiation and a possibility to test a pion-photon interaction model near two-pion threshold