TrendLine property
Chart trend lines are horizontal lines that span the chart canvas and that help users to interpret the data being displayed, with respect to some predetermined value.
Use the TrendLine property to get or set values for the various attributes of a trend line. For a complete list and description of these attributes, see the topic "Specifying trend line settings for charts."
For an example on how to use this property and its attributes when modifying a chart through script, see the topic "ChartAddTrendLine method."
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