In the embodiment according to FIGS 2 and 3, {HEAD ~ the collector} 14 is {TAIL ~ a high pressure collector} 
is
In the embodiment according to FIGS 2 and 3 , { HEAD ~ the collector } 14 is { TAIL ~ a high pressure collector }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL