Table 2.

Matrix of the experimental plan for power in the range 1–4 W.

No	x 0	x 1	x 2	x 3	R 1	R 2	R 3	R av	S2(y)i
1	+	+	+	+	1.8	1.5	1.5	1.6	0.03
2	+	+	+	-	3.3	3.4	3.9	3.53	0.1
3	+	+	-	+	1.5	1.4	1.7	1.57	0.023
4	+	+	-	-	2.1	2	2.7	2.27	0.14
5	+	-	+	+	1.9	1.9	1.9	1.9	0
6	+	-	+	-	1.9	1.9	2.2	2	0.03
7	+	-	-	+	2.6	2.7	2.4	2.57	0.02
8	+	-	-	-	1.9	1.9	1.9	1.9	0