The following group codes apply to aligned dimensions. In addition to the group codes described here, those listed in Common Group Codes for Entities and Common Dimension Group Codes can also be present.
Aligned dimension group codes 


Group code 
Description 
100 
Subclass marker (AcDbAlignedDimension) 
12 
Insertion point for clones of a dimension—Baseline and Continue (in OCS) DXF: X value; APP: 3D point 
22, 32 
DXF: Y and Z values of insertion point for clones of a dimension—Baseline and Continue (in OCS) 
13 
Definition point for linear and angular dimensions (in WCS) DXF: X value; APP: 3D point 
23, 33 
DXF: Y and Z values of definition point for linear and angular dimensions (in WCS) 
14 
Definition point for linear and angular dimensions (in WCS) DXF: X value; APP: 3D point 
24, 34 
DXF: Y and Z values of definition point for linear and angular dimensions (in WCS) 
The point (13,23,33) specifies the start point of the first extension line and the point (14,24,34) specifies the start point of the second extension line. Point (10,20,30) specifies the dimension line location. The point (11,21,31) specifies the midpoint of the dimension text.