Fluoride ppm	Pasture	Ranks
16.4	U	2
22.5	D	15
18.3	D	7
19	D	10
17.2	U	4
20.9	D	13
23.4	D	16
17.9	U	6
16.6	D	3
18.5	D	8
18.7	U	9
20.2	D	12
21.8	D	14
17.2	U	5
13.3	U	1
19.2	D	11