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| Basically, the surface of the weld is broken into two pieces. The dividing line is the right edge of the upper plate. Any part of the surface of the weld that is Right of this edge are "Right of the Projection", and the rest are Left of the Projection. |
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| The left points are all projected (parallel to the upper plate) to the edge of the upper plate, where the lowest point is used as a base point in other calculations like the Triangle Slide. |
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