Table 2. Composition of experimental formulations (runs).
| Formulation | X1 | X2 |
| F1 | -1 | -1 |
| F2 | -1 | 0 |
| F3 | -1 | +1 |
| F4 | 0 | -1 |
| F5 | 0 | 0 |
| F6 | 0 | +1 |
| F7 | +1 | -1 |
| F8 | +1 | 0 |
| F9 | +1 | +1 |
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