Table 1.
Independent variables and their levels.
| Variables | Low (−1) | Center (0) | High (1) |
|---|---|---|---|
| Power [W] | 100 | 450 | 800 |
| Time [s] | 30 | 105 | 180 |
| Solid ratio [g/50 mL] | 1 | 3.5 | 6 |
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