2.1.1415 Part 1 Section 21.1.3.1, cell3D (Cell 3-D)
a. The standard states that the default value of the prstMaterial attribute is plastic.
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Office uses a default value of dkEdge for this attribute.
b. The standard does not specify the default value for the rig attribute if no lightRig element is specified.
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Office uses "flood" for the rig attribute of lightRig in cell3D if no lightRig is specified.