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The Fritzsch ansatz for the quark mass matrices will run into conflict with the existing data on the Cabibbo-Kobyashi-Maskawa mixing angles if the top quark mass turns out to be much greater than 90 GeV. A modification of the Fritzsch scheme is presented in which only one diagonal element of the quark mass matrix vanishes. The new scheme is still simple to analyze exactly and can easily accommodate top quark mass as heavy as 250 GeV or more without conflicting with our present knowledge on the weak interaction mixing angles.
Subhash Rajpoot (Mon,) studied this question.