2.1.1540 Part 1 Section 21.2.2.170, ser (Bar 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 maxOccurs value for the dPt child element is unbounded.
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Office limits the occurrences of this element to 4000 when inside a bar3DChart and 32000 otherwise.