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EDIT:

I don't know if it is real, but I've attached a copy here. It is from Mago's post in June 2016. Not hi-res, but the best I could find. You might ask Mago for a better source.
 

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I'll work on getting you a higher res version of this.
It would also be nice to get some verification of the accuracy of that diagram.

One of the reputable sites that did PCIe topology maps of the system had a couple of differences from that diagram.
 
The diagram that @ActionableMango posted is straight from the Apple Technician Guide, so it is safe to assume that it is accurate. Doesn’t mean it’s perfect, but it is certainly the beat thing we have from the manufacturer.
 
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