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Let P be an x-monotone polygonal path in the plane. For a path Q that approximates P let W"A(Q) be the area above P and below Q, and let W"B(Q) be the area above Q and below P. Given P and an integer k, we show how to compute a path Q with at most k edges that minimizes W"A(Q)+W"B(Q). Given P and a cost C, we show how to find a path Q with the smallest possible number of edges such that W"A(Q)+W"B(Q)=