2.1.1319 Part 1 Section 20.1.10.16, ST_Coordinate (Coordinate)
a. The standard states that the contents of the ST_Coordinate simple type can be at least -27273042329600 and at most 27273042316900.
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Word and PowerPoint restrict the contents of this simple type to be at least -2147483648 and at most 2147483647.
b. The standard states that ST_Coordinate is read and written as either a length followed by a unit, or EMUs with no unit present.
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Office will read either a length followed by a unit or EMUs with no unit present, but will write only EMUs when no units are present.