obs     x1        y1        x2        y2
        1      1.86      4.53      5.19      7.48
        2     -1.65    -10.88      3.13      6.25
        3      4.26      0.93      3.67      6.73
        4      9.43     16.35     -0.15      1.09
        5      3.09     -0.13      2.39      7.56
        6     11.19       6.2      9.07     12.15
        7      5.12     -0.93      6.44      8.32
        8      5.04      3.76       2.3      4.92
        9      0.69      -3.1      3.27      3.53
       10     10.88       5.8      3.33      2.64
       11     -1.16      0.81      6.19       8.6
       12      0.96      -5.5       5.3      9.69
       13     -4.77     -6.05      3.59      6.06
       14      5.78      9.36      0.61      7.78
       15     10.58      6.41      4.28      8.93
       16      8.57     10.46      7.32     13.29
       17      3.67     -0.36      7.63     11.43
       18      6.25      1.59      6.75     10.37
       19       9.6     11.59      6.78      7.93
       20      6.57      7.29      1.77      5.63