In {TAIL ~ both the gantry and fixed beam configurations}, {HEAD ~ the patient table} can be fixed or moveable 
In
In { TAIL ~ both the gantry and fixed beam configurations } , { HEAD ~ the patient table } can be fixed or moveable
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH