The left and right margins of the object, expressed in text rows.
HMargin is set to 0 if both HMargin (character columns) and WdgHMargin (twips) are null.
An integer (1 to 999)
Indicates the width of the interior unusable space from the left and right edges of the rectangle occupied by the object. For DisplayForm objects, this refers to the form object identified by the DisplayForm entry.
VMargin, WdgHMargin, WdgVMargin