2.1.1544 Part 4 Section 5.7.2.141, pie3DChart (3D Pie Charts)
a. The standard states that multiple ser elements may be specified on this element.
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Office only displays the first series if there are multiple ser child elements.
b. The standard states that the maxOccurs value for the ser child element is unbounded.
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Office limits the occurrences of this element to 255.