Standard Origins and Orientations

3DEM Image Conventions

Cyclic Symmetry



Standard orientation:  symmetry axis is aligned with the z-axis.
(Note that the repeating motif can "begin" at any angle about the symmetry axis. 
The angle of the x and y axes with respect to the motif is arbitrary and user-defined.

Standard origin:  on symmetry axis (z-axis)


Example of C5 symmetry with z-axis perpendicular to x-y plane

Example of C5 symmetry in standard orientation
and standard display orientation




Back to standard origins/orientations table
11 Feb 2006