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