Processing method: Extraction: Spectrum (UV tab)

In the UV tab, you set the parameters used to extract UV spectra:

Arbitrary spectra	If required, select Use external time range to use the time range defined below for background subtraction. This setting affects all time point spectra that do not belong to a peak.
Peak spectra	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 (apex or other): None: Do not subtract a background spectrum from peak spectra. Spectrum at baseline start: Use the spectrum at the baseline start as a background for peak spectra. Spectrum at baseline end: Use the spectrum at the baseline 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 specific peak spectra or for arbitrary spectra: The average UV spectrum of the given time range is used as the background spectrum.