# Table 4.2 from Davis (2002)
# distance(m) vs magnesium (ppm)
0	6.44
1820	8.61
2542	5.24
2889	5.73
3460	3.81
4586	4.05
6020	2.95
6841	2.57
7232	3.37
10903	3.84
11098	2.86
11922	1.22
12530	1.09
14065	2.36
14937	2.24
16244	2.05
17632	2.23
19002	0.42
20860	0.87
22471	1.26
