y      x1   x2
14.3171  6.2  3.8
12.4540  5.5  3.2
14.3840  6.8  3.1
14.1014  6.2  3.8
14.1845  5.8  4.2
14.1663  5.9  4.1
13.9815  6.9  3.0
15.7612  6.9  4.5
13.8039  6.0  3.7
13.9912  6.3  3.8
12.9733  5.7  3.4
15.2926  5.1  3.3
13.5998  5.9  4.0
14.0843  6.4  3.7
13.9148  5.5  4.2
13.9870  5.9  4.2
14.3339  6.1  4.1
14.7547  6.6  3.9
14.4456  6.5  4.3
15.4053  6.6  4.4