Fig. 1
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DFMS mass spectrum collected on 3 August 2015 around integer mass 105 (black square markers). The peaks - here associated to C7H5O and C8H9 at the exact positions indicated by the dashed blue lines – are fitted with double-Gaussian functions (dashed red and green lines). The standard deviation of the fitted peak position is ≈6 × 10−4.
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