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Fitting straightens the pieces of an outline that lie close to a line, and Snap Curves To Lines straightens more of them. The outline of a single pixel, or of a region one pixel thick along an edge such as an opaque row of a mid tone under a light shape, can then have all its pieces on one line. The trace held a selectable path with no area, for example a path 140 x 0 px with Snap Curves To Lines. In a Color, Grayscale or Black and White trace with Fills, a fitted outline or hole whose area is below 1e-6 px^2 is now left out. A path with no area paints nothing, so the traced result paints the same pixels as before. Without Fills, the 1 px stroke that outlines each area draws such a loop, so it is kept. A single closed loop keeps its area as before.