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The drawing shows a two-dimensional coordinate system where the horizontal axis plots gamma sub r, ranging from negative 0.9 to 0.9 in increments of 0.2, with negative 1 and 1 marked at the two ends for theta sub r equals 180 degrees and theta sub r equals 0 degrees, respectively. The vertical axis plots gamma sub i, ranging from negative 0.9 to 0.9 in increments of 0.2, with negative 1 and 1 marked at the two ends for theta sub r equals 270 degrees and theta sub r equals 90 degrees, respectively. A unit circle is drawn with the origin as the center, and intersecting plus 1 and negative 1 on both the axes. Point D is marked at negative 1 on the horizontal axis, representing a short-circuit load, while point C is marked at plus 1 on the horizontal axis, representing an open-circuit load. Two vectors, A and B are drawn from the origin. A is drawn in the first quadrant at theta sub r sub A equals 53 degrees, and the absolute value of gamma sub A equals 0.5, while B is drawn in the third quadrant at theta sub r sub B equals 202 degrees, and the absolute value of gamma sub B equals 0.54. A third vector is drawn in the second quadrant for the absolute value of gamma equals 1.