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Common adducts found by COVINA. (A) Heatmap showing the intensity of the adduct ions relative to the intensity of [M-H]−. Δm/z is calculated as m/z(adduct)-m/z([M-H]−). The Δm/z values in the same arithmetic sequence are grouped together to show compounded repeating units of the same adduct. (B) Histogram of Δm/z pairwise differences of all the covariant ions within each metabolite group. The most common Δm/z values are highlighted in the plot.
