D3.js多个y轴具有相同的刻度位置？

更新v3:

更新第4版:

是否可以在y轴上的刻度之间设置填充？或者更好地说"禁用刻度线之间的距离,并将其设置为固定值"

.tickValues() - doesn't help in this case...

function create_Y_axes() {
  var _key, _currentKeyIndex, yDomain_before, yDomain_after,  yD_min,  yD_max,  _index;

  for (var i = 0; i < series.length; i++) {

    _key = series[i]["unit"];
    _currentKeyIndex = yCategories.indexOf(_key);

    if (_currentKeyIndex === -1) {
      //If key not found in array
      yCategories.push(_key);

      series[i]["yAxis"] = yCategories.length - 1;

      _y.push(
        d3.scale.linear()
          .domain(d3.extent(series[i]["UNIT_DATA"], function(d,i){return d.wert;}))
          .range([chartHeight, 0])
          .nice()
      );

    } else {
      series[i]["yAxis"] = _currentKeyIndex;
    }
  } //for

  var yDomain,min, max, ticks = 10, r1,r2,range,stepL,stepR, t, tArray, h;

  for (var i = 0; i < _y.length; i++) {

    yDomain = _y[i].domain();// [-60, 60]

    min = yDomain[0];// -60
    max = yDomain[1];//  60

    h = Math.floor((ticks / 2));

    stepL = (Math.abs(min / h));
    stepR = (Math.abs(max / h));

    r1 = d3.range(min, 0 - stepL, stepL);
    r2 = d3.range(0, max + stepR, stepR);

    tArray = d3.merge([r1, r2]);

    t = d3.scale.ordinal().domain(tArray).rangePoints([chartHeight, 0]).domain();
      _yAxis.push(
        d3.svg.axis()
              .scale(_y[i])
              .orient("left")
              .tickPadding(5)
              .tickValues(t)
              .tickFormat(function(d){return d.toFixed(2);})
      );

  } 

}// createYaxes()