Philips V24CT User's Reference Manual page 281

Event
The patient monitors can be adjusted in monitoring mode so that an event
Threshold Line is either triggered by an alarm or by criteria defined specifically by the
user.
The event trigger level is represented in the graph by a threshold line,
located in each graph channel. This line enables the user to see the
following:
Note—
Center, the Bradycardia threshold line is displayed as a shaded area.
1. Whether a trigger is active. This means that the parameter is
switched on, the parameter alarm is switched on, the main alarms
are switched on and valid numerical values are available. The
threshold line is indicated on the graph by an unbroken line.
2. At what value it has been set.
3. Whether it has been changed during the 24-hour review period.
(2) Non Active Threshold Line
When the patient monitor is connected to the Philips Information
(1) Event Threshold Line
(3) Trigger Level Change
Viewing Neonatal Events
Neonatal Event Review 9-7