Density Contours

A chart showing the relationship between waiting and eruption times of the Old Faithful geyser in Yellowstone National Park. Adapted from This example is intended to illustrate how external libraries (in this case d3-contour) can easily be integrated into florence.

The (async () => { ... })() bit is a so-called Immediately Invoked Function Expression, which is just a way to define a function and run it immediately without having to give it a name. It is used here to contain all logic that depends on asynchronous operations like fetching datasets.