I think you should already be able to draw most of the causal diagrams from that paper already: you can use `\circ` for the white circles and `\bullet` for the

I think you should already be able to draw most of the causal diagrams from that paper already: you can use `\circ` for the white circles and `\bullet` for the black ones. Perhaps the only missing feature is being able to draw double-ended arrows? That's on my to-do list; let me know if there's something else that's missing.