Contour

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A directed curved line consisting of line segments and arcs (including the edges of the model). Contours are used to display X-Y plots or tables, and to calculate integrals.

Rules applied to the contours:

• Contour may not intersect itself.

• Open and closed contours are discerned.

• Multiply connected contours have sense only for calculating integral quantities.

Contour is shown in the window as a set of directed lines or color-filled interior (closed counter-clockwise-directed contours).