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# Long description

This figure is in two parts, (a) and (b), and shows two copies 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 from zero to the labelled point 1, the second from the point 1 to the labelled point 1 plus i and the last from 1 plus i to the labelled point i. Part (b) is concentrated in the upper-right and upper-left quadrants. A closed contour is shown and labelled capital gamma with a marked arrow in an anticlockwise direction. The contour is a line segment and a semicircle with the line segment from the labelled points negative 1 to point 1 and the semicircle from the point 1 to the point negative 1 passing through the labelled point i.