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Based on the Union2 data, the least-$\\chi^2$ fit of the scalar perturbed $\\Lambda$CDM model shows that the universe has a preferred direction $(l,b)=(287^\\circ\\pm25^\\circ,11^\\circ\\pm22^\\circ)$. The magnitude of scalar perturbation is about $-2.3\\times10^{-5}$. The scalar perturbation for the $\\Lambda$CDM model implies a peculiar velocity, which is perpendicular to the radial direction. 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