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After fitting a mathematical outline of splines and lines to a pixel outline (see section 10.1.1 Finding pixel outlines), Limn aligns the endpoints on the fitted outline. This involves simply checking each spline to see if its starting point and ending point (in either axis) are "close enough" to each other. If they are, then they are made equal to their average.
This is useful because even a slight offset of the endpoints can be produce a noticeable result, especially for straight lines and corners.
By default, "close enough" is half a pixel. You can change this with the `-align-threshold' option.