Table 3.
Experimental code and actual levels.
| Independent variables | Unit | Range and levels | ||||
|---|---|---|---|---|---|---|
| − 1.68 | − 1.00 | 0.00 | + 1.00 | + 1.68 | ||
| Carbon source, X1 | g/L | 3.20 | 10.0 | 20.0 | 30.0 | 36.8 |
| KNO3, X2 | g/L | 0.16 | 0.5 | 1.0 | 1.5 | 1.84 |
| TE solution, X3 | mL/L | 0.16 | 0.5 | 1.0 | 1.5 | 1.84 |
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