Computes error of the parent ion mass to charge measurement from
The returned value is in points per million (ppm).
An instance of class "MSnID".
It may be more common to compute "mass measurement error". However, the practical difference in "mass measurement error" and "mass to charge measurement error" is negligible. Moreover, the instruments measure mass/charge ratio, not mass per se.
Returns mass to charge measurement error in "ppm" units.
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