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prime() converts "classical delta" values to "delta prime" values.
prime()
prime(classical)
Returns the "delta prime" value (‰).
"Classical delta" values to be converted (‰).
$$\delta'^{17}O = 1000 \times \ln(\frac{\delta^{17}O}{1000}+1)$$
unprime() converts "delta prime" values to "classical delta" values.
unprime()
prime(10) # Return 9.950331
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