Table 3.

DoE statistical results

	a1x1	a2x2	a3x3	a12x1x2	a23x2x3	a13x1x3	b	R2	p
y1	3.04	−3.79	33.71	−3.44	0.89	9.12	66.95	0.84	0.126
y2	0.39	−5.96	36.09	0.03	−0.51	7.61	69.11	0.87	0.084
y3	254.58	−1963.66	3747.09	−52.92	−317.50	324.64	15178.3	0.84	0.129
y4	−0.01	0.22	−1.02	0.01	0.01	0.08	5.86	0.96	0.004