Andrew’s Pitchforks are defined by 3 points. Order for points (1) and (2) does not matter, but point (3) always define the origin point of the central line.

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After you select “Add Pitchfork” in the popup menu, the program with wait for three left clicks defining three points. At any time, right click cancel the sequence.

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If you select and delete one the pitchfork lines, the pitchfork is deleted. You can, however, define colors and thicknesses independently for each line.