Chapter 4 Examining Chromatogram Data
4
Displaying additional filtered tracesHint: Add mode is useful when you are filtering the same trace for different event tags. The original trace remains displayed and accessible. Each filtered trace (up to four total traces) is added, allowing for visual comparison.
7.To return to the original trace, see “Returning to the original trace” on page
Note the following when evaluating filtered traces:
•If you select more than one tag to display, all spectra containing the specific combination of tags are included in the filtered trace.
For example, assume the MS Method used to acquire the data specifies Tag 1 for event 1, and both Tag 1 and Tag 2 for event 2. If you select Tag 1 to filter, spectra from event 1 are included in the filtered trace, but not spectra from event 2.
•A filtered trace displays data points for the selected tags only. However, if you
•Any actions you perform on a filtered trace, such as summing, include only the spectra displayed in the filtered trace. Spectra from areas of the filtered trace that do not appear to contain data are not included.
NOTE: In a summed trace, the trace label includes the spectrum numbers for all spectra in the summing range, even if they are not in the filtered trace. However, only the spectra with the appropriate tags are included in the summed spectrum.
To display additional filtered traces:
1.Select the original, unfiltered trace.
2.From the Process menu, select Event Tag Filtering, then select the tags to display.