excellent, thanks. fwiw there is a parcoords in the test plots in the repo https://github.com/observablehq/plot/blob/main/test/plots/cars-parcoords.js#L15

Ah thanks! Didn't notice, probably would have saved me some time debugging, hahah :)

it seems that when you color by year (for example), connections tend to jump over instead of being row by row (not sure how to describe this in words ;-) )

I've shared my version here https://observablehq.com/@fil/plot-parcoords