public BufferedImage drawLineGraph(String graphTitle,String xLabel,String yLabel,HashMap<ComparableLabel,Integer> dataPoints){
  return drawLineGraphWithStdDev(graphTitle,xLabel,yLabel,dataPoints,null,null,null);
}

public BufferedImage drawLineGraph ( String graphTitle , String xLabel , String yLabel , HashMap < ComparableLabel , Integer > dataPoints ) { return drawLineGraphWithStdDev ( graphTitle , xLabel , yLabel , dataPoints , null , null , null ) ; }
draws a line graph without adding the standard deviation high and low lines
