Data frame of isotope masses and abundances for a number of elements.
A data frame with four columns:
name of element
isotopes of an element
mass of an isotope of an element
abundance of an isotope of an element
The data frame (or any other data frame with that format) serves as argument for the isopattern function. The first column of the data frame also contains names of specific [isotopes] used for labeled compounds.
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