obs	weight	length	width
1	5.9	8.8	1.4
2	100	19.2	3.3
3	110	22.5	3.6
4	120	23.5	3.5
5	150	24	3.6
6	145	25.5	3.8
7	300	28.7	5.1
8	300	30.1	4.6
9	685	39	6.9
10	650	41.4	6
11	820	42.5	6.6
12	1000	46.6	7.6