nvd3 + discreteBarChart + add a line to chart

问题

working with discreteBarChart in nvd3 here is the basic example in jsfiddle

I have created this bar chart and I have got my data that feeds it to look like this as is required:

var data = [
  {
    key: "KPI_NAME",
    values: [
      { 
        "label" : "A" ,
        "value" : -29.765957771107,
          "series" : 0
      } , 
      { 
        "label" : "B" , 
        "value" : 0,
          "series" : 0
      } , 
      { 
        "label" : "C" , 
        "value" : 32.807804682612,
          "series" : 0
      } , 
      { 
        "label" : "D" , 
        "value" : 196.45946739256,
       "series" : 0
      } , 
      { 
        "label" : "E" ,
        "value" : 0.19434030906893,
       "series" : 0
      } , 
      { 
        "label" : "F" , 
        "value" : -98.079782601442,
       "series" : 0
      } , 
      { 
        "label" : "G" , 
        "value" : -13.925743130903,
       "series" : 0
      } , 
      { 
        "label" : "H" , 
        "value" : -5.138732287,
       "series" : 0
      }
    ]
  }
]

see the jsfiddle example -> this is with the series added "series: 0" to my data object. This is just how I am creating my object and does not affect the graph.

now i have added another series to my data feed and what i am trying to do is have a constant line in the graph but i get the following in this example(this is with the second series added in my data object)

Is there away I can get the second series to be a line so I would have a constant line accross the top with value 98?

Note: My data that feeds this graph could possibly be formatted better but I am just try to reuse what I already have.

来源：https://stackoverflow.com/questions/22391330/nvd3-discretebarchart-add-a-line-to-chart