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Formatting of isotopes.
If you need to convert to ppm from Hz values, consider during this in your relax script. <br>
If for example you have recorded at a 800 MHz spectrometer, you could find the Carrier position for 15N <sup>15</sup>N (Value of yCar in NMRPipe scripts). If yCAR = 118.078 ppm, then
<source lang="python">
from lib.nmr import frequency_to_Hz, frequency_to_ppm