In {TAIL ~ order} to reduce the flow resistance in the gas path of the lance, {HEAD ~ the through openings} each have an opening width which is larger in the circumferential direction than in the radial direction 
In
In { TAIL ~ order } to reduce the flow resistance in the gas path of the lance , { HEAD ~ the through openings } each have an opening width which is larger in the circumferential direction than in the radial direction
REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH