This subject is covered, with several examples, in:
[How to design PCBs - Appendix A: How to deal with Off-PCB parts.](https://docs.google.com/document/d/1CU7RuPyFlSZPzWBN-YZ0x87xeAB4xpLdLaIsUwhLj_M/edit#heading=h.xxt5yo1ar0j6)<br>
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