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Check the possible contaminants
contam(mz, ppm = 10, mode = c("+", "-"))
suspected m/z value
mass tolerance, default value = 10
ionization mode, either positive '+' or negative '-'
# NOT RUN { contam(33.0335, ppm = 10, mode = '+') contam(44.998, ppm = 10, mode = '-') # }
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