Open Access
Table 1.
Limits of variation of experimental factors.
| Conditions planning | Limits for measuring factors | ||||
|---|---|---|---|---|---|
| X1 | X2 | X3 | X4 | ||
| Main level | 50 | 90 | 0.21 | 0.045 | |
| Variation interval | 10 | 30 | 0.10 | 0.015 | |
| Upper level (+1) | 60 | 120 | 0.31 | 0.060 | |
| Lower level (‐1) | 40 | 60 | 0.11 | 0.030 | |
| Upper star point (+2) | 70 | 150 | 0.41 | 0.075 | |
| Lower star point (‐2) | 30 | 30 | 0.01 | 0.015 | |
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