| Kind | Value | annotation | ||
| enumeration | 9_very dark | |||
| enumeration | 8_dark to very dark | |||
| enumeration | 7_dark | |||
| enumeration | 6_medium to dark | |||
| enumeration | 3_light | |||
| enumeration | 4_light to medium | |||
| enumeration | 5_medium | |||
| enumeration | 2_very light to light | |||
| enumeration | 1_absent or very light |