EXFO FastReporter 2 - Manual (Page 183)

Working with OLTS Files
Post Processing Software 173
Changing OLTS Settings
3. Set the wavelength list as needed if you are using the thresholds from
the application:

To add a wavelength, click the button, enter the wavelength
value, and click OK.

To remove one or more wavelengths, select the values in the
Wavelength list and click the
button.
Each wavelength can have different thresholds. If you have selected
the custom thresholds, you can modify the values. The Apply option
must be enabled for the values to be active and modifiable.
If you select more than one wavelength in the list, any modification to
the thresholds will apply to all of the selected wavelengths.