Mass spectral histograms

Figure 2. Mass spectral histograms of tetrapyrrole pigments characteristic of mid-/late-diagenesis. (a) free-base 7,8-dihy-dro-DPEP-series (b) free-base DPEP-series and (c) nickel DPEP (ETIO- omitted)-series. Sample Pliocene/Miocene shale of marine origin (cf. 24).

FIGURE 5.31 Histograms of mass spectral peak intensities at m/z 77 for 300 compounds with a phenyl substructure and 300 compounds without a phenyl substructure. The peak intensities are divided into 10 intervals between 0% and 100% base peak intensity. For each interval, the frequency of peaks is given for both groups. 

T ) Mass spectrum between 62 and 66 mass units for the unspiked sample containing 1% dissolved organic matter. The mass spectral peaks for copper were normalized and displayed in histogram format. 

FIGURE 10.5 Histogram representation of the mass spectral peaks that would be observed for the (a) carboxypeptidase and (b) aminopeptidase digestion of the peptide DAEFR forming a perfect ladder mixture. 

FIGURE 10.17 Histogram representation of the mass spectral peaks that would be observed for the a. 

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