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Hello, I am working on an environmental research paper and this journal has been a very helpful source of information. However, I am unable to figure out when the last three letters mean in this supplemental data sheet https://doi.org/10.7717/peerj.12848/supp-1 from the article, "Soil health and nutrient density: preliminary comparison of regenerative and conventional farming", published on Januar...

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Data Table Explanation
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