{HEAD ~ The nozzle} is formed of and defined by two moveable nozzle parts, {TAIL ~ the relative position} of which determines the size of a discharge cross section in the nozzle 
{ HEAD ~ The nozzle } is formed of and defined by two moveable nozzle parts , { TAIL ~ the relative position } of which determines the size of a discharge cross section in the nozzle
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH