EXFO FTB-7000 OTDR for FTB-200 v2 - Manual (Page 83)

Testing Fibers in Template Mode
OTDR 69
Acquiring Traces in Template Mode
4. If applicable, the application will display the number of new events
detected for each wavelength.
4a. Press OK to close the dialog box.
Note: You can only add events to the reference trace during reference update.
Note: If you chose the Keep all events feature for the acquisitions that will be
performed after the update, you may find it useful to add newly detected
events to obtain a more accurate reference trace.