| Kind | Value | annotation | ||
| enumeration | 1_incurved with reflexed apex | |||
| enumeration | 2_strongly incurved | |||
| enumeration | 3_slightly incurved | |||
| enumeration | 5_slightly reflexed | |||
| enumeration | 6_strongly reflexed | |||
| enumeration | 7_reflexed with incurved apex | |||
| enumeration | 4_straight |