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Ranges and levels of the factors in coded form for L27OA.
| Factors w/% | Symbol | Coded level | ||
|---|---|---|---|---|
| −1 | 0 | 1 | ||
| Orange peel | χ 1 | 0.25 | 0.50 | 1.0 |
| Bactopeptone | χ 2 | 0.2 | 0.3 | 0.5 |
| MgCl2 | χ 3 | 0.3 | 0.59 | 0.75 |
| Ferric Citrate | χ 4 | 0.005 | 0.01 | 0.03 |
| CaCl2 | χ 5 | 0.1 | 0.18 | 0.24 |
| NaCl | χ 6 | 0.8 | 1.2 | 1.4 |
