| Code Figure | Meaning |
|---|---|
| 0 |
Grid points at triangle vertices |
| 1 |
Grid points at centers of
triangles |
| 2 |
Grid points at midpoints of triangle sides |
| 3 |
Grid points at shape vertices |
| 4 |
Grid points at centre of shapes |
| 5 |
Grid points at midpoints of shape sides |
| 6-191 |
Reserved |
| 192-254 |
Reserved for Local Use |
| 255 |
Missing |