| Kind | Value | annotation | ||
| enumeration | 1_mainly in basal quarter | |||
| enumeration | 2_mainly in basal half | |||
| enumeration | 3_mainly in basal three quarters | |||
| enumeration | 4_throughout | |||
| enumeration | 5_mainly along basal quarter of midribs | |||
| enumeration | 6_mainly along basal half of midribs | |||
| enumeration | 7_mainly along basal three quarters of midribs | |||
| enumeration | 8_mainly along entire length of midribs |