The first and second stages of {TAIL ~ the compressor} are used to provide the combined compressed low and medium pressure off {HEAD ~ gas stream} 
The first and second stages of { TAIL ~ the compressor } are used to provide the combined compressed low and medium pressure off { HEAD ~ gas stream }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD