EXFO FastReporter 2 - Manual (Page 184)

Working with OLTS Files
174 FastReporter 2
Changing OLTS Settings
4. To apply the changes without closing the dialog box, click Apply. To
apply the changes and close the dialog box, click OK.
You can view the results for in the OLTS Table tab in the main window.
Note: In the case of multi-wavelength files, the reference unit may show dB
and/or dBm depending on the measurement.