Chapter 3 Peak Detection and Labeling

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Figure 3-8 Max Charge State Set Too Low and Max

Isotope # Set Correctly

The grouping of the first and fourth peaks into an isotope cluster is apparent when you turn on monoisotopic peak list filtering (Figure 3-9). The software labels the first peak, but

3removes the mass and charge state labels from the 559.3 m/z peak, indicating that it is part of the 558.3 m/z isotope cluster.

Note that turning on monoisotopic peak list filtering does not affect the mass labels on the 558.6 m/z or 558.9 m/z peaks, because these peaks have no calculated charge and are not part of the determined isotope cluster.

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Figure 3-9 Max Charge State Set Too Low,

Monoisotopic Peak List Filtering Turned On

3-34 Applied Biosystems