A half dimension is created and only one extension line 
			is displayed. The dimension line is shortened with a specific 
overrun, 
			gap, and length. The value is not aligned with the center of the dimension line. The 
			
attributes mentioned in
			the 
Dimension Parameters 
			determine the graphic display 	of the dimension.
Note:
			When you create a dimension from an axis to a geometry or from a geometry to an axis  using interactive commands, a half dimension is created by default when no user preference is available.