2.1.1605 Part 4 Section 5.7.2.212, trendline (Trendlines)

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.

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