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5
»baseline levels
4
»background level
3
»background concentrations
3
»background values
3
»natural levels
3
»naturally occurring levels
2
»reference concentrations
2
»reference levels
2
»reference points
2
»ambient levels
2
»background increment
2
»basal levels
2
»base levels
2
»natural concentrations
2
»normal levels
2
»reference level
1
»basic levels
1
»essential levels
0
»baseline values
0
»basic standards
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