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Flash Player 7
Flash MX 2004.
lineChartInstance.plotLine(points:Object[, lineLabel:String[, lineColor:Number]])
points An object with each item refencing an identifier
  of a point on the horizontal axis (See LineChart.points for
  more) 
lineLabel The label displayed in the line's tooltips,
    and in the legend. Optional.
lineColor  The line color if you don't want to
  use the default color scheme. Optional. 
Nothing.
Method; adds a line to the LineChart, and redraws the chart.
The following example adds a line labeled Assets to linechart
  instance linechart: 
chart.plotLine({Sunday:12, Monday:5, Tuesday:15, Wednesday:10, Thursday:18, Friday:30, Saturday:25}, "Assets");
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