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| Independent Variable | Symbol | Code Levels | ||
|---|---|---|---|---|
| -1 | 0 | 1 | ||
| Glucose concentration, g L -1 | X 1 | 5 | 10 | 15 |
| Optical density, OD 600 nm | X 2 | 0.7 | 2.1 | 3.5 |
| Induction temperature, °C | X 3 | 24 | 28 | 32 |
