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