wildfire3 Drawing Setup option documentation for: witness_line_delta            

witness_line_delta

sets the extension distance of the witness line (1) from the dimension leader arrow.

• 0.125000*—the default value is 0.125000. you can specify a different value for the distance between the witness line and dimension leader arrow.

note: the drawing_units drawing setup file option determines the unit of measurement for the witness_line_delta drawing setup file option.