EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 311)

Managing Results
Optical Spectrum Analyzer 303
Managing WDM Test Results
Note: If a channel is already included in the channel list, the application will ask if
you want to replace the threshold and analysis parameters for that
channel. Select Yes, No or Cancel as required. If the channel is not present
in the channel list, it will be added provided the number of channels does
not exceed the maximum allowed count of 1000 channels in the channel
list.
Note: The application will re-analyze the modified channel only with the new
channel parameters.
5. Press OK to save the changes for the active trace, re-analyze and close
the window, or press Cancel to exit without saving.
Press Restore Defaults to remove all the changes and apply the default
values.