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The three precision measurements of the cross section$\sigma\big(e^+e^-\rightarrow\pi^+\pi^-\gamma(\gamma)\big)$ using initial stateradiation by the KLOE collaboration provide an important input for theprediction of the hadronic contribution to the anomalous magnetic moment of themuon. These measurements are correlated for both statistical and systematicuncertainties and, therefore, the simultaneous use of these measurementsrequires covariance matrices that fully describe the correlations. We presentthe construction of these covariance matrices and use them to determine acombined KLOE measurement for$\sigma\big(e^+e^-\rightarrow\pi^+\pi^-\gamma(\gamma)\big)$. We find, from thiscombination, a two-pion contribution to the muon magnetic anomaly in the energyrange $0.10 < s < 0.95$ GeV$^2$ of $a_{\mu}^{\pi^+\pi^-} = (489.8 \pm 1.7_{\rmstat} \pm 4.8_{\rm sys} ) \times 10^{-10}$.

Combination of KLOE  $\sigma\big(e^+e^-\rightarrow\pi^+\pi^-\gamma(\gamma)\big)$ measurements and  determination of $a_{\mu}^{\pi^+\pi^-}$ in the energy range $0.10 < s < 0.95$  GeV$^2$