A reusable scatter plot inspired by [Towards Reusable Charts](https://bost.ocks.org/mike/chart/) and [Observable: selection.join](https://observablehq.com/@d3/selection-join).
Shows the [Iris Dataset](https://gist.github.com/curran/a08a1080b88344b0c8a7).
Using dataset from https://opendata.cbs.nl/statline/portal.html?_la=nl&_catalog=CBS&tableId=84064NED&_theme=384
Observations:
- data available, but not in form direct usable by scatterplot
- some data have 'missing' values - how to handle them