| 摘要 |
A plate element constructed to simulate a plurality of hexagonal pins aligned so that their center lines are in a common plane and such that adjacent pins abut at a common face. The edge of the plate element normal to the hexagonal pins is cut to exhibit three, mutually perpendicular, square, optical facets for each hexagonal pin. The facets in each group of three are parallel, respectively with the facets in every other group of three.
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