Difference
The nodal difference is the difference between the maximum and minimum corner results at a node.
For tensor/vector components, the corresponding components from each element corner are extracted and the difference is calculated. For invariants, the corresponding invariants are computed from each element corner and then the difference is calculated.
The sign of a value is considered in the difference calculation. For example, the difference for the values, 200, 400, 100, and 500 is 900.
Element Type  Reference System  Projection Rule  Description 

Solid  Global  N/A  All corresponding tensors and vectors are transformed to the global coordinate system and then the difference for a component or invariant is calculated as explained above. 
Analysis  N/A  All corresponding tensors and vectors are left in their original coordinate
system (no transformation occurs) and then the difference for a component or
invariant is calculated as explained above. In this case, each participating element result can be in a different system. Difference calculation for components ignores variations in systems. Since invariance does not depend on the coordinate system, all reference systems will produce the same results for invariants. 

Elemental  N/A  All corresponding tensors and vectors are transformed to the elemental
coordinate system and then the difference for a component or invariant is
calculated as explained above. In this case, each participating element result can also be in a different system. Difference calculation for components ignores variations in systems. 

Userdefined  N/A  All corresponding tensors and vectors are transformed to the userdefined coordinate system and then the difference for a component or invariant is calculated as explained above.  
Shell  Global  ON  All corresponding tensors and vectors are transformed to the projected system
(following the projection rule) of the participating elements and then the
difference for a component or invariant is calculated as explained above. As a result, even if the reference system is the same, the projected systems in participating elements can be different. Difference calculation for components ignores variations in systems. 
OFF  All corresponding tensors and vectors are transformed to the global coordinate system and then the difference for a component or invariant is calculated as explained above.  
Analysis  N/A  All corresponding tensors and vectors are left in their original coordinate
system (no transformation occurs) and then the difference for a component or
invariant is calculated as explained above. In this case, each participating element result can be in a different system. Difference calculation for components ignores variations in systems. 

Elemental  N/A  All corresponding tensors and vectors are transformed to the elemental
coordinate system and then a component or invariant is averaged as explained
above. In this case, each participating element result can also be in a different system. Difference calculation for components ignores variations in systems. 

Userdefined  ON  All corresponding tensors and vectors are transformed to the projected system
(following the projection rule) of the participating elements and then the
difference for a component or invariant is calculated as explained above. As a result, even if the reference system is the same, the projected systems in participating elements can be different. Difference calculation for components ignores variations in systems. 

OFF  All corresponding tensors and vectors are transformed to the userdefined coordinate system and then the difference for a component or invariant is calculated as explained above. 
Valid reference coordinate system: All (Global, Analysis, Elemental, and Userdefined)