The invention is also directed to the interstage cooling of {HEAD ~ one refrigeration cycle} by {TAIL ~ the other refrigeration cycle} 
The invention is also directed to the interstage cooling of { HEAD ~ one refrigeration cycle } by { TAIL ~ the other refrigeration cycle }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL