Philips V24CT User's Reference Manual page 98

Displaying Split Screen Trends
In addition to this, the trend to which the alarm limits apply is displayed
with a thicker line than the other trends.
Viewing Trend Because the NBP is not a continuously measured parameter, a special
Data for Non- symbol is used to display the trend values, as shown in the diagram
invasive Blood
below.
Pressure
Display of Trend Data for Non-invasive Blood Pressure - Example
3-24 Setting up your Monitor