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# Long description

This figure is in two parts: (a) and (b). Each part is a copy of the unlabelled complex plane. Part (a) is concentrated in the upper-right quadrant and shows a contour capital gamma labelled and marked with an arrow in an anticlockwise direction. The contour is made up of three line segments. The first labelled capital gamma sub 1 from zero to the labelled point 2, the second labelled capital gamma sub 2 from the point 2 to the labelled point 2 plus i and the last labelled capital gamma sub 3 from 2 plus i to the labelled point i. Part (b) is identical to the left but it is the reverse contour that is indicated. The contours are labelled with capital gamma tilde.