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A single term expression in the form of a Power law with two unknown coefficients is proposed. It explains fairly well the energies of ground bands in even-even nuclei in the A= 150-200 region. The index" b" and the coefficient" a" in this expression are fairly constant independent of the level spin, below the back bending energy. Variation of average" a" and" b" with Z and N, and with the valence nucleon pair product N p N n is also illustrated and agrees with general expectations.