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We propose a systematic procedure for constructing effective models ofstrongly correlated materials. The parameters, in particular the on-sitescreened Coulomb interaction U, are calculated from first principles, using theGW approximation. We derive an expression for the frequency-dependent U andshow that its high frequency part has significant influence on the spectralfunctions. We propose a scheme for taking into account the energy dependence ofU, so that a model with an energy-independent local interaction can still beused for low-energy properties.Comment: 16 pages, 5 figure

Frequency-dependent local interactions and low-energy effective models from electronic structure calculations