The guide vane structure 21 is pushed to a large extent into the die plate 23 and is therefore in {HEAD ~ its blocking position} which reduces {TAIL ~ the effective inlet flow cross section} 
reduces
The guide vane structure 21 is pushed to a large extent into the die plate 23 and is therefore in { HEAD ~ its blocking position } which reduces { TAIL ~ the effective inlet flow cross section }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL