Processing method: Extraction: Spectrum (MS tab)

In the MS tab, you set the parameters used to extract MS Spectra:

Arbitrary spectra	If desired, select Use external time range to use the time range defined below for background subtraction. This setting affects all time point spectra that are not peak spectra. You can extract such spectra with the spectrum extraction tool.
Peak spectra	Under Spectrum type, define which type of spectrum you want to extract for peaks: Peak apex spectrum: The spectrum will be extracted at the time point of the peak apex. Average peak spectrum: The spectrum will be averaged over the time range of the peak.
	Under Background mode, choose the spectrum that you want to use as a background spectrum. The corresponding spectrum will be subtracted from all peak spectra: None: Do not subtract a background spectrum from peak spectra. Spectrum at peak start: Use the spectrum at the peak start as a background for peak spectra. Spectrum at peak end: Use the spectrum at the peak end as a background for peak spectra. Spectrum at peak start and end: Use the average spectrum from peak start and peak end as a background for peak spectra. External background time range: Use the time range defined below as a background for peak spectra.
External background time range	If you use an external time for peak spectra or for arbitrary spectra: The average MS spectrum of the given time range is used as a background spectrum.
Automatic spectrum extraction	Select the check box to automatically extract MS spectra during reprocessing. Spectra are extracted from the apex of the relevant peaks: Identified Peaks: Spectra are extracted from an MS chromatogram using the peaks listed in the compound table. All Peaks: Spectra are extracted for all peaks of an MS chromatogram.
Spectrum threshold	Provide a threshold for m/z values that are visible on an MS Spectrum. See Add MS spectrum threshold to the method.
Spectral smoothing	Configure smoothing of MS spectra. See Configure MS spectral smoothing.

See Also

• MS Spectrum