Table A1.
Independent variables and their levels used in the response surface design.
| Variables | Symbol | Coded Levels | ||||
|---|---|---|---|---|---|---|
| −2 | −1 | 0 | 1 | 2 | ||
| Gelatin (g) | X 1 | 11 | 12 | 13 | 14 | 15 |
| Cornstarch (g) | X 2 | 16 | 17 | 18 | 19 | 20 |
| Sucrose (g) | X 3 | 6 | 7 | 8 | 9 | 10 |
| EWP (g) | X 4 | 11 | 12 | 13 | 14 | 15 |
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