"Sample","Gravimetric","Spectrophotometric"
1,54.7,55
2,58.5,55.7
3,66.8,62.9
4,46.1,45.5
5,52.3,51.1
6,74.3,75.4
7,92.5,89.6
8,40.2,38.4
9,87.3,86.8
10,74.8,72.5
11,63.2,62.3
12,68.5,66