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This sample demonstrates how to show the trend line (Exponential) on the column chart.

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  <Line2DSeries ... showTrendLine="true" trendLineType="exponential" >
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showTrendLine The showTrendLine attribute determines whether or not to display the trend line on the chart.
trendLineForm The trendLineForm attribute is used to set the display type of the trend line.
valid values : segment, curve, step, reverseStep.
trendLineType The trendLineType attribute is used to set the method of the trend line.
valid values : linear, logarithmic, exponential, polynomial, power, movingAverage.
movingAveragePeriod The movingAveragePeriod attribute is used to set the moving average term (trendLineType = "movingAverage").
polynomialOrder The polynomialOrder attribute is used to set the degree of the polynomial order (trendLineType = "polynomial").

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