AutoCAD 2012 DXF Reference February 2011 © 2011 Autodesk, Inc. All Rights Reserved. Except as otherwise permitted by Autodesk, Inc., this publication, or parts thereof, may not be reproduced in any...... 80 Linear and Rotated Dimension Group Codes . . ...spacing10, 20$GRIDUNIT Snap grid rotation angle50$SNAPANG Snap/grid...