Broken link: *rect* mark should link to /@observablehq/plot-rect

Fixed, thank you.

Quantitative dimension is optional？

Fixed, thanks!

Oops, no, this was right as it was originally: the quantitative dimension is required, while the ordinal dimension is optional. What’s a little confusing in the hadcrut example is that the ordinal dimensional is here temporal—but we’re using the interval option to treat it as ordinal.

The z channel was removed in favor of the sort transform.