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Independent variable values of the process and their corresponding factor levels.
| Independent variable | Symbols | Factor levels | ||||
|---|---|---|---|---|---|---|
| -α (-1.682) | -1 | 0 | +1 | +α (1.682) | ||
| Temperature (°C) | A | 16.6 | 20 | 25 | 30 | 33.4 |
| Inoculum concentration (%, v/v) | B | 6.6 | 8 | 10 | 12 | 13.4 |
| Lantan camara fruit concentration (%, v/v) | C | 6.6 | 8 | 10 | 12 | 13.4 |
