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The aromaticity of the benzene ring in the (eta6-C6H6)Cr(CO)3 complex is analyzed using several indicators of aromaticity based on different physical manifestations of this property. All indices used except NICS show that there is a clear reduction of the aromaticity of benzene upon coordination to the Cr(CO)3 complex. The particular behavior of the NICS index has been analyzed in detail and we have...