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Catalyst system for producing ethylene copolymers in a high temperature solution process, the catalyst system comprising (i) a metallocene complex of formula (I) (ii) an aluminoxane cocatalyst and (iii) optionally a boron containing cocatalyst. The definitions for M, X, L, n, R1, R<SP>1'</SP>, R2, R<SP>2'</SP>, R5, R<SP>5'</SP>, R6, R<SP>6'</SP>, R7, and R<SP>7'</SP> are provided in the specification or claims.