The invention relates to a data packet structure for conveying data of service data units using protocol data units. The output pattern includes signals associated with noise, and signals associated with the biological sample, some of which are degraded or obscured by noise. The notification parameters are indicative of one or more aspects of the navigational notification such as time-sensitivity, priority or the like. The inlet 15b is also fed with the hot bed material from the material separator 8. The physiological data received from the first medical monitoring device and the physiological data received from the second medical monitoring device are displayed on a central display station. The passage communicates with the first and second chambers and has a groove disposed on a bottom wall of the case.