2.1.1538 Part 1 Section 21.2.2.168, ser (Area Chart Series)
a. The standard states that the maxOccurs value for the trendline child element is unbounded.
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Office limits the occurrences of this element to 254.
b. The standard states that the minOccurs value for the val child element is 0.
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Office requires an occurrence of this element.
c. The standard states that the maxOccurs value for the dPt child element is unbounded.
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Office limits the occurrences of this element to 4000 when inside an area3DChart and 32000 otherwise.