obs	typepot	g	iron
1	Aluminum	1	1.77
2	Aluminum	1	2.36
3	Aluminum	1	1.96
4	Aluminum	1	2.14
5	Clay	2	2.27
6	Clay	2	1.28
7	Clay	2	2.48
8	Clay	2	2.68
9	Iron	3	5.27
10	Iron	3	5.17
11	Iron	3	4.06
12	Iron	3	4.22