This source may include {HEAD ~ an airstream} entrained with {TAIL ~ particles} which is discharged into the space through an orifice; the airstream diverging as it enters the space 
This source may include { HEAD ~ an airstream } entrained with { TAIL ~ particles } which is discharged into the space through an orifice ; the airstream diverging as it enters the space
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH