EXFO FTB-700 for FTB-1 - Manual (Page 250)

Analyzing Traces with the Bidirectional Analysis Application (Optional)
242 FTB-700 Series
Customizing the Events Table

Injection level: In the events table, the injection level is represented by
the
icon. In the Att. column, the injection level value for that event
is identified by the @ symbol.
You can hide the injection level value and symbol from the
Att. column, but not the
icon.

Event: You can display or hide the comments relative to a specific
event. Such comments would be displayed in a tooltip along with the
details of the event type (see Events Tab on page 206).
A red triangle appears next to the event number to indicate that a
comment has been inserted manually for a specific event.
Note: If you have not selected the Show event comment in tooltip option in the
Events setup tab, the red triangles will not appear even if there are
comments.
To add or modify comments about events, you must use either
FastReporter or the application of the OTDR for the FTB-500.