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Per meg

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Per meg equals 0.001 permil or 0.0001 percent or parts per million ppm. The unit is typically used in isotope analysis by multiplying an isotope ratio in delta annotation, for example δ¹⁸O, by 1000000.^[1]^[2] This annotation is typically used in studies of atmospheric trace gases, where a high precision is needed for a significant interpretation of results. ^[3]

References

^ http://scrippso2.ucsd.edu/units-and-terms
^ "Per Meg, Anyone? Picarro's New Isotopic Water Analyzer Achieves per Meg Precision | Picarro". Archived from the original on 2016-08-17. Retrieved 2016-08-12.
^ http://132.239.121.69/publications/ralph/3_Seasonal.pdf ^{[bare URL PDF]}

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