  The KLOE measurement of phi radiative decays and of the ratio
Gamma(Ks->pi+pi-(gamma))/Gamma(Ks->pi0pi0) are discussed. The first measurement
aims at understanding the real nature of the scalar mesons a0 and f0, whose
possible compositions are qq, qqqq, or KK molecule. The second measurement is
related to the estimate of the phase shift difference delta0-delta2. Previous
measurements were affected by a large uncertainty due to the presence of
radiative effects which are correctly included in our analysis.
