Your example works if you use co instead of cf. I don't know whether to call this a documentation or implementation bug. It certainly seems weird that, say, sb (solid box) uses the fill color while di uses the background color. The documentation seems more consistent, but who knows.

Certainly the documentation seems to have gotten an incomplete conversion from 10th Edition unix and has been that way for Plan 9's history; see the definition of ra, referring to a missing table of max dimensions. I don't have a 10th Edition system handy to check how the implementation behaves here.

In any case, my initial question was based on a misunderstanding of what graph was giving plot. What I want is essentially a ridgeline plot; to get that I think I'd either have to make graph fill a polygon below the vectors (maybe that could just be a filter looking for an m command followed by a bunch of v commands?) or teach plot about a new ridgeline command.

I also had plot's -p wrong, based on a documentation error, but that didn't matter because it's a no-op in our current implementation anyway. 🤷
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