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Using a sample of over 400 million phi->KsKl decays produced during the years2001 and 2002 at the DAFNE e+e- collider, the ratioR=Gamma(Ks->pi+pi-(g))/Gamma(Ks->pi0pi0) has been measured with the KLOEdetector. The result isR=2.2555+-0.0012(stat)+-0.0021(syst-stat)+-0.0050(syst), which is in goodagreement with the previously published result based on the KLOE data samplefrom the year 2000. The average of the KLOE results is R=2.2549+-0.0054,reducing the total error by a factor of three, to 0.25%.Comment: 13 pages, 13 figures, submitted to Eur. Phys. J.

Precise measurement of Γ(KS→π+π-(γ))/Γ(KS→π0π0) with the KLOE detector at DAΦNE