{TAIL ~ Air} travels through said tube and passes through a plurality of holes along the length of {HEAD ~ the tube} in the general direction of the area where the laser beam strikes the workpiece 
{ TAIL ~ Air } travels through said tube and passes through a plurality of holes along the length of { HEAD ~ the tube } in the general direction of the area where the laser beam strikes the workpiece
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH