2.1.1562 Part 1 Section 21.2.2.211, trendline (Trendlines)

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a.   The standard states that this element can be a child of ser elements.

Office requires that when this element is specified, the ancestor include an areaChart or lineChart with the grouping element equal to standard, a barChart with grouping element equal to clustered, or a bubbleChart, scatterChart or stockChart.