      y pressure batch
1  90.3     8500     1
2  92.5     8700     1
3  85.5     8900     1
4  82.5     9100     1
5  89.2     8500     2
6  89.5     8700     2
7  90.8     8900     2
8  89.5     9100     2
9  98.2     8500     3
10 90.6     8700     3
11 89.6     8900     3
12 85.6     9100     3
13 93.9     8500     4
14 94.7     8700     4
15 86.2     8900     4
16 87.4     9100     4
17 87.4     8500     5
18 87.0     8700     5
19 88.0     8900     5
20 78.9     9100     5
21 97.9     8500     6
22 95.8     8700     6
23 93.4     8900     6
24 90.7     9100     6