| COD/treatment Type | Cases | LS mean | LS sigma | Homogeneous groups | |||||
| No treatment | 9 | 65.856 | 0.445 | X |
|
|
| ||
| HCl +HNO3 | 9 | 80.418 | 0.444 |
| X |
|
| ||
| HNO3 | 9 | 84.400 | 0.444 |
|
| X |
| ||
| HCl | 9 | 87.933 | 0.444 |
|
|
| X | ||
| Color/treatment Type | Cases | LS mean | LS sigma | Homogeneous groups | |||||
| No treatment | 9 | 55.466 | 0.714 | X |
|
| |||
| HCl +HNO3 | 9 | 84.111 | 0.714 |
| X |
| |||
| HNO3 | 9 | 85.656 | 0.714 |
| X |
| |||
| HCl | 9 | 91.722 | 0.714 |
|
| X | |||