Table 4.
Independent variables and their levels for Box-Behnken design.
| Independent Variables | Symbol | Variable Levels | ||
|---|---|---|---|---|
| −1 | 0 | 1 | ||
| Temperature (°C) | X1 | 60 | 65 | 70 |
| Mass ratio of PLand CH | X2 | 3:1 | 4:1 | 5:1 |
| HT mass (mg) | X3 | 2 | 4 | 6 |
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