Roll	pH
1	7.9
2	8
3	7.7
4	7.7
5	7.8
6	8
7	8.4
8	7.5
9	7.7
10	7.8
11	7.9
12	7.7
13	7.2
14	7.7
15	7.8
16	7.7
17	7.3
18	7.7
19	7.6
20	7.9
21	7.6