docs: function getIntersectingIntervals(ary, mapLoFn, mapWidthFn, loVal, hiVal) {
      var tmp = [];
      iterateOverIntersectingIntervals(ary, mapLoFn, mapWidthFn, loVal, hiVal,
                                       function(d) {
                                         tmp.push(d);
                                       });
      return tmp;
    }