y	x1	x2	x
2.5	3.0	1.5	25.0
1.1	4.0	1.6	5.2
3.8	3.3	0.3	49.0
4.8	3.8	0.2	82.0
2.0	3.5	0.8	14.0
0.8	3.7	1.6	3.2
3.2	3.8	0.4	38.0
1.3	3.5	1.1	10.0