divs.push(drawBox(xscale, box));
    }
    divs.push(drawSep(-adjust, posTotal, negTotal));

    const h = (list.length > 0 ?  list[list.length-1].y : 0) + 4*ROW;
    chart.style.height = h+'px';
    chart.replaceChildren(...divs);
  }

  function drawBox(xscale, box) {
    const srcIndex = box.src;
    const src = stacks.Sources[srcIndex];

    function makeRect(cl, x, y, w, h) {