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by portman 3213 days ago
It's a beeswarm plot, linked in the footnotes: https://bl.ocks.org/mbostock/6526445e2b44303eebf21da3b662732...

As such, the x-axis is a metric about the population, not the individual. I happen to use them a fair bit as I find them easier to intuit density from than the alternative, which is to plot on a single line with transparency.