Conc,Strength
1,6.3
1.5,11.1
2,20
3,24
4,26.1
4.5,30
5,33.8
5.5,34
6,38.1
6.5,39.9
7,42
8,46.1
9,53.1
10,52
11,52.5
12,48
13,42.8
14,27.8
15,21.9