|  | sym | - the section symmetries | 
|  | stratum | - the stratum value in the label that we are assigning symmetries for | 
|  | size | - the number of dofs for points in the stratum of the label | 
|  | minOrient | - the smallest orientation for a point in this stratum | 
|  | maxOrient | - one greater than the largest orientation for a ppoint in this stratum (i.e., orientations are in the range [minOrient, maxOrient)) | 
|  | mode | - how sym should copy the perms and rots arrays | 
|  | perms | - NULL if there are no permutations, or (maxOrient - minOrient) permutations, one for each orientation.  A NULL permutation is the identity | 
|  | rots | - NULL if there are no rotations, or (maxOrient - minOrient) sets of rotations, one for each orientation.  A NULL set of orientations is the identity |