A horizontal bar graph with four coloured bars. The colours from top to bottom are blue, yellow, orange and orange. The numbers 0 to 45 are listed from left to right along the bottom axis. On the left hand side of the graph MN (20 ppm) is listed beside the blue bar, B (20 ppm) is listed beside the yellow bar, S (0.25%) is listed beside the first orange bar. K (1.7% Ontario is listed beside the second orange barn.

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