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In the interval $0.2<R/R_\\odot<0.65$, the quantity $U=P/\\rho$ is determined with and accuracy of $\\pm 5$\\permille~or better. At the solar center still one has remarkable accuracy, $\\Delta U/U <4%$. We compare the predictions of recent solar models (standard and non-standard) with the helioseismic results. 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