opacity artifacts in line segments

Community Help
2

It’s tricky but possible:

d3.groups(grouped_tracks, (d) => `${d.WSR_ID}:${d.CELL_ID}:${d.run_id}`)
      .map(([z, track]) =>
        Plot.line(track, {
          x: "LON",
          y: "LAT",
          stroke: "blue",
          strokeWidth: (d) => d.MAX_REFLECT - 45,
          render: function (index, scales, values, dimensions, context, next) {
            const g = next(index, scales, values, dimensions, context);
            g.style.opacity = 0.1;
            return g;
          }
        })
      ),

this however won’t work well with the automatic tip mark (tip: true), so you’ll need to create a second mark just for the tip.