//   self: number;	   // From corresponding Group
  // };

  function groupWidth(xscale, g) {
    return xscale * (g.sumpos + g.sumneg);
  }

  function renderGroup(depth, xscale, x, y, g, direction) {
    // Skip if not wide enough.
    const width = groupWidth(xscale, g);
    if (width < MIN_WIDTH) return;