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   ocr: 0.75 wWwwi Wwwww WW - MW Wy 0.5 0.25 2.5 5 75 10 12.5 15. 0,25 -0.5 0.75 WWWwww WW WWAN Figure 2: The Gibbs phenomenon; aiscontinaities are bard to appraximate with sine and cosine wrves,