A plotly.js scatterpolar trace auto-detected by MAIDR. The
data navigates exactly as a multi-line chart does — a spoke is a column
and a series is a row — and what the circle adds is carried in the
panning: the sweep goes out and back, 12 o'clock at centre, 3 o'clock
hard right, 9 o'clock hard left, so a radar does not sound like a row of
bars. A barpolar trace (a rose or coxcomb chart) reads the
same way and is announced as a polar area.