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| Variables | Coded Xi | Coded level | ||
|---|---|---|---|---|
| −1 | 0 | +1 | ||
| Ratio of core to primary coating material | X1 | 1.0:9.0 | 2.5:7.5 | 4.0:6.0 |
| Ratio of primary emulsion to secondary coating material | X2 | 1.0:9.0 | 2.5:7.5 | 4.0:6.0 |
