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I added an example SPC chart from my own 'fab's data. Is it a Control Chart, but it's not as sophisticated as an industry-level SPC which would include a "spec limit" meaning the final delivered product is out of spec, not just tracking this one fabrication step. I mention that in the caption.
However it should still give the reader a visual for why SPC is useful and how it can be implemented.
If anyone has screenshots from an MES or related software, that would be great. The UCSB Nanofab's images+data are public - whereas most companies won't publish such data, so I figured this is a good starter example.