Thermonicolet Omnic Software User's Guide 6.1 (PDF) - Charles E ...

2. Click the Annotate button to the right of the title box.
Note
The Annotate button is available only if Annotation is turned on in the Display
Setup dialog box. ▲
The corrected height measurement appears as an annotation near the peak,
with a line indicating the baseline used for the measurement.
You can position the annotation
text by using the annotation tool.
You can label another peak with its corrected height by repeating steps 1 and 2.
After you click the Annotate button, the annotation remains on the screen when
you label another peak. When you are finished labeling peaks, you can print the
spectrum with all the annotations by using Print in the File menu.
Note
When you save a spectrum, its annotations are saved and will be displayed when
you later open the spectrum. ▲
Peak area tool
Use the peak area tool to find the area under a peak. The area is measured from a
baseline connecting the low points on either side of the peak and between the X
values of specified points in the peak. (High points on either side of the peak are
used for the baseline if the spectrum is in % transmittance). This area is called the
“corrected peak area.”
You can adjust the baseline and the region limits to define the peak area you want
to measure (this is explained in the procedures that follow).
The tool also finds and displays the uncorrected peak area. The uncorrected area is
measured from zero absorbance instead of the baseline. (In a transmittance
spectrum, the uncorrected area is measured from 100% transmittance.)
By using the Annotate button after measuring a peak area, you can annotate peaks
with their corrected areas. You can then print the spectrum with these annotations.
34 Thermo Nicolet