DIMTIX system variable
Function Description:
The DIMTIX system variable is used to draw text between extension lines.
Type : Parameter 
Saved in : Drawing 
Initial value : off
System Variable Value:
Off : for linear dimension and angular dimension, place dimension text internal extension lines if there is sufficient space
On : draw dimension text between extension lines even if the text is usually placed outside of extension lines. For radius dimension and diameter dimension, the                          dimension text could be forced to place external of circles or arcs by DIMTIX system variable.