| Altitude levels | BL | DOC | SAB | BAL | ||||
| <700 m | 5.72 | ab | 5.91 | a | 5.80 | a | 5.78 | ab |
| 700 m - 825 m | 5.76 | ab | 5.84 | ab | 5.83 | a | 5.80 | a |
| 825 m - 950 m | 5.62 | b | 5.70 | b | 5.64 | b | 5.65 | b |
| >950 m | 5.77 | a | 5.84 | ab | 5.82 | a | 5.79 | a |