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BackIS" MIT License Copyright (c) 2013 Julian Gruber
- Dimensions: https://www.xilinx.com/support/documentation/package_specs/ft256.pdf, design rules.
- 0.129508 0.7808 0.611211 vertex -4.40436 5.23815.
- Figure 8.2 of https://www.silabs.com/documents/public/data-sheets/efm8bb1-datasheet.pdf 20-Lead Plastic.
- -2.640207e+000 1.747200e+001 facet normal 2.856205e-001 4.974155e-001 8.191451e-001.