Philips V24CT User's Reference Manual page 253

Viewing Patient Data
If you change a value in Hemodynamics Calculations, (for example, you
change ABP from 120 to 140), the new value will be identified in Patient
Data graphs by a star (*).
Note— (CMS only) For the 9-hour database, the default time period is 9
hours, with 4.5 hours of information displayed at any one time. Data
within the other 4.5 hours can be viewed by scrolling with the arrow keys
Trends and Calculations 8-15