Here are the data structures with brief descriptions:
  FNode | Data struct for representing nodes in a graph |
| PixelList | Data struct for representing pixels |
| SNode | Data struct for representing nodes in a graph |
| Volume | Run-length encoding of a volumetric object |
| Volumes | Linked list containing volumes |
| VoxelList | Data struct for representing voxels |
| VPoint | Data struct for representing labelled voxels. The label is a float value |
| VTrack | Part of a run-length encoded volume |
 XPoint | Data struct for representing 3D points |
