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(a) Numbers of compounds extracted by Progenesis QI from the two different instrument platforms, 6545 and 6520, and either profile (P) or centroid (C) mode. (b) Compound numbers versus log10(abundance) and γ distribution γ(α, β) fits for the four types of data. The percentage of the overlapped area between the histogram and γ distributions is shown in each of the plots along with the standard deviation σ and the two parameters α and β.
