docs: function() {
      var maxValue = 0;
      this.st.graph.eachNode(function(n) {
        var valArray = n.getData('valueArray'),
            acumLeft = 0, acumRight = 0;
        $.each(valArray, function(v) { 
          acumLeft += +v[0];
          acumRight += +v[1];
        });
        var acum = acumRight>acumLeft? acumRight:acumLeft;
        maxValue = maxValue>acum? maxValue:acum;
      });
      return maxValue;
    }