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One can determine the efficiency of a microwave 2-port by measuring the reflection coefficient Gamma sub 1 at the input port when the output port is terminated by a sliding short-circuit. The locus of Gamma sub 1 is a circle whose radius equals the efficiency eta sub 2 m of energy entering port 2 when port 1 is terminated in a non-reflecting load. Similarly eta sub 1 m is the radius of the Gamma sub 2 - circle when port 1 is terminated in a sliding short-circuit. This note describes a procedure for obtaining, from the same measured data, new reflection coefficients Gamma sub 1 n and Gamma sub 2 n, whose circular loci have radii R sub 1 n and R sub 2 n equal to efficiencies of the 2-port when connected to an arbitrary load of reflection coefficient Gamma sub L. (Author)