Chapter 6  ENTITIES Section
DIMENSION 
Ordinate Dimension Group Codes

The following group codes apply to ordinate 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. For information about abbreviations and formatting used in this table, see "Formatting Conventions in This Reference."
Ordinate dimension group codesGroup codes  Description 
100 
Subclass marker (AcDbOrdinateDimension) 
13 
Definition point for linear and angular dimensions (in WCS) 
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) 
24, 34 
DXF: Y and Z values of definition point for linear and angular dimensions (in WCS) 
The point (13,23,33) specifies the feature location and the point (14,24,34) specifies the leader end point. The point (11,21,31) specifies the midpoint of the dimension text. Point (10,20,30) is placed at the origin of the UCS that is current when the dimension is created.