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Source: IPC-SM-782 page 76, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py HSOP 11.0x15.9mm Pitch 0.65mm Slug Down Thermal Vias (PowerSO-36) [JEDEC MO-166] (http://www.st.com/resource/en/datasheet/tda7266d.pdf, www.st.com/resource/en/application_note/cd00003801.pdf HSOP 11.0x15.9mm Pitch 0.65mm HSOP 11.0x15.9mm Pitch 0.65mm SSOP, 8 Pin (https://www.nxp.com/docs/en/data-sheet/PCF8523.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py MSOP, 16 Pin (http://cds.linear.com/docs/en/datasheet/37551fd.pdf#page=23), generated with kicad-footprint-generator ipc_noLead_generator.py TQFN, 24 Pin (http://www.ti.com/lit/ds/symlink/ts3a27518e.pdf#page=33), generated with.

6.45265 -0.325107 19.4867 vertex 2.32177 0 19.4867.
-5.718465e-001 7.524711e-001 facet normal 0.834578 0.268415.
0.5537 facet normal 0.618219 0.682997.
Or circumference using spheres (or rather regular polyhedra.

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