x1	x2	x1x2	strength absorbability
21	.65	13.65	33.55	8.42
21	.55	11.55	47.55	6.26
7	.65	4.55	35	6.74
7	.55	3.85	35.9	6.59
28	.6	16.8	40.9	7.28
0	.6	0	39.1	6.9
14	.7	9.8	31.55	10.8
14	.5	7	48.	5.63
14	.6	8.4	42.3	7.43