Accepted answer

You can use this!

return [
      values: data,      //values - represents the array of {x,y} data points
      key: 'Money', //key  - the name of the series.
      color: '#33ccff'  //color - optional: choose your own line color.


In your CSS:

.nv-group.nv-series-0 {
    stroke-opacity: 1; 
    fill-opacity: 0.5; 
    fill: red; 
    stroke: red;

This will change the color for the first line to red, for example. Use .nv-group.nv-series-1 for second line, and so on...

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