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Fill partial area between curves

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This is a graph of two plotted functions. The graph demonstrates Origin's Fill Area Under Curve > Fill to next data plot - Above Below Colors feature. Enabling this option fills the area between two plots, fill color being dependent upon which is greater: 2x3-x2-5x or -(x)2 + 3x.

The unfilled area where x≥1 is accomplished by plotting those portions of the two functions separately.

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