radialArea in polar with a point scale on angle and a closed curve to draw one series as a filled shape.radialDot mark over the area, on the same angle and radius fields, to mark each month's value.radialArea marks in one polar to compare two series on the same axes, the later one drawn on top.fillOpacity to 0 and widen strokeWidth to draw each series as an outline, so overlapping shapes stay readable.shape: "circle" on radialGrid to draw round rings instead of polygons behind the series.angleGrid a stroke of "transparent" to keep the month labels and drop the spokes between the rings.fill and fillOpacity to a circular radialGrid to tint the rings and drop their outlines.fill and fillOpacity to a polygon radialGrid to tint the rings behind a borderless series.radialGrid a single entry in values to draw just one outer ring around the series.radialGrid and hide the spokes to show only the shape, its dots and the month labels.labels in radialGrid and set labelAngle and labelRotate to print the ring values along one spoke.radialText marks outside the rings, one for both totals and one for the month.Badge dots under the chart, colored from chartColors.series, to name each series.Icon in its color instead of a dot, in a row under the chart.fold, normalize and select to turn raw results in different units into one comparable profile on a 0 to 100 scale.color on one radialArea to a group field to draw a translucent shape per country on the same normalized axes.