The separation chamber is positioned in {HEAD ~ the annularly shaped slot} and rotated at {TAIL ~ a predetermined rotational velocity} 
The separation chamber is positioned in { HEAD ~ the annularly shaped slot } and rotated at { TAIL ~ a predetermined rotational velocity }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL