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The minimum and maximum levels of factors in the central composite design
| Factor | Units | Minimum | Maximum | ‐α | + α |
|---|---|---|---|---|---|
| Concentration of salt | % | 1 | 5 | 0.977311 | 6.02269 |
| Concentration of sugar | % | 1 | 5 | 0.977311 | 6.02269 |
| Period of fermentation | Days | 1 | 21 | −4.11345 | 21.1134 |
