Time	Soil depth	d 15 N	d 15 N
[Year]	[cm]	[]	s.e. 
1994	-1	-2.37	0.2
	-3	-0.27	0.04
	-5	-0.27	0.03
	-8	1.64	0.02
1995	-1	10.68	1.5
	-3	8.19	4.46
	-5	5.59	3.02
	-8	1.67	0.85
1996	-1	22.6	3.34
	-3	8.91	1.29
	-5	7.51	0.92
	-8	4.81	0.47
1997	-1	50.4	9.93
	-3	7.9	0.69
	-5	6.63	0.56
	-8	5.58	0.66
