obs x y
1 0.99 90.01
2 1.02 89.05
3 1.15 91.43
4 1.29 93.74
5 1.46 96.73
6 1.36 94.45
7 0.87 87.59
8 1.23 91.77
9 1.55 99.42
10 1.4 93.65
11 1.19 93.54
12 1.15 92.52
13 0.98 90.56
14 1.01 89.54
15 1.11 89.85
16 1.2 90.39
17 1.26 93.25
18 1.32 93.41
19 1.43 94.98
20 0.95 87.33