Table 3.

Matrix of the experimental plan for power in the range 4–6 W.

No	x 0	x 1	x 2	x 3	R 1	R 2	R 3	R av	S2(y)i
1	+	+	+	+	2.6	2.7	3.2	2.83	0.1
2	+	+	+	-	1.8	1.5	1.5	1.6	0.03
3	+	+	-	+	1.7	1.8	1.8	1.77	0.003
4	+	+	-	-	1.5	1.4	1.7	1.53	0.02
5	+	-	+	+	11.6	11.4	11.2	11.4	0.04
6	+	-	+	-	1.9	1.9	1.9	1.9	0
7	+	-	-	+	3	2.9	2.9	2.93	0.003
8	+	-	-	-	2.6	2.7	2.4	2.57	0.02