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Determines the distance the object is offset horizontally from the origin of the object's border. The default value is 0; the default formula is F="ImgWidth*0".
Optional string. Represents a unit of measure. The default is DL. For details about DL, see https://msdn.microsoft.com/en-us/library/aa218417(v=office.10) Units of measure.
Optional string. Represents the element's formula. This attribute can contain the string "someFormula" if the formula exists locally, "No Formula" if the formula is locally deleted or blocked, or "Inh" if the formula is inherited.
If the attribute is not present, the element's formula is a simple constant, for example, <element> 5 </element>.
Optional string. Indicates that the formula evaluates to an error. The value of Err is the current value (an error message string); the value of the element is the last valid value.
The ImgOffsetX element is relevant only when contained in a https://msdn.microsoft.com/en-us/library/aa203207(v=office.10) Shape element. It is ignored when contained in a https://msdn.microsoft.com/en-us/library/aa191981(v=office.10) DocumentSheet, https://msdn.microsoft.com/en-us/library/aa203159(v=office.10) PageSheet, or https://msdn.microsoft.com/en-us/library/aa203205(v=office.10) StyleSheet element.
https://msdn.microsoft.com/en-us/library/aa165998(v=office.10) ImgOffsetX cell (Foreign Image Info section)