Table 1.

Codded and actual values of the experimental design.

Treatment	Coding values (X 1 = enzyme load, X 2 = I/S ratio)		Actual values (X 1 = enzyme load, X 2 = I/S ratio)
	X 1	X 2	X 1	X 2
1	−1	−1	3	0.7
2	1	−1	13	0.7
3	−1	1	3	3.3
4	1	1	13	3.3
5	−1.414	0	0.93	2
6	1.414	0	15.07	2
7	0	−1.414	8	0.16
8	0	1.414	8	3.83
9	0	0	8	2
10	0	0	8	2
11	0	0	8	2