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Chapter 4 Examining Chromatogram Data
4-26 Applied Biosystems
4
Hint: 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 4-4.
Evaluating
filtered traces
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 double-click the filtered trace in an
area that does not appear to contain data, a spectrum is
displayed in the Spectrum window.
• 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.
Displaying
additional filtered
traces
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.