Chapter 3 Peak Detection and Labeling

Peak Processing parameters (spectrum data only)

Table 3-3describes the parameters in the Peak Processing tab of the Spectrum Peak Detection Setup dialog box (see Figure 3-5 on page 3-16).

Default peak detection values are listed in Section 3.7, Default Peak Detection Settings.

Table 3-3 Peak Processing Parameters (Spectrum Data Only)

 

 

Parameter

 

Description

 

 

 

 

 

 

Integration Baseline Settings

 

 

NOTE: You can set peak labels to display peak start, peak end, and baseline

 

 

marks. See Section 3.5.2, Setting Chromatogram and Spectrum Peak Labels.

 

 

 

 

 

 

Valley-to-Baseline

 

Draws a vertical line from all valleys to a horizontal baseline.

 

 

 

 

 

The level of the horizontal baseline is determined using the

 

 

 

 

minimum peak valley point (left or right) for each peak. See

3

 

 

 

Figure 3-25 on page 3-70.

 

 

 

 

 

Valley-to-Valley

 

Forces a baseline through all valley points. See Figure 3-25

 

 

 

 

 

 

 

on page 3-70.

 

 

 

 

 

 

 

Spectrum Parameters

 

 

 

 

 

 

 

Centroid %

 

Specifies the percentage of peak height used to determine

 

 

 

 

the location of the centroid mass. For example, with a

 

 

 

 

Centroid % of 10, the software examines the top ten percent

 

 

 

 

of signal.

 

 

 

 

 

 

 

Enable Gaussian

 

Increases the accuracy of the centroid calculation for

 

 

Fitting

 

spectral peaks with limited data points (fewer than 6 data

 

 

 

 

points across the peak), in particular, Mariner data below

 

 

 

 

m/z 400.

 

 

 

 

 

 

 

 

 

Continued

3-26 Applied Biosystems