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The 2.4 release of plotutils introduced an abstration between user
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coordinates and normalized device coordinates (NDC). The NDC are
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defined as a viewport with coordinates of (0,0), (1,0), (1,1),
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(0,1). This change means, however, that plots based on a larger
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coordinate system need to include a setmatrix operation at the
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beginning of each page.
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Please see /usr/share/doc/plotutils/COMPAT for further information.