{HEAD ~ The method} 6 wherein {TAIL ~ the step} of injecting a flow of cold cryogen vapor includes the steps of injecting at least a first flow of cold cryogen vapor into the first conduit means, and injecting at least a second flow of cold cryogen vapor into the second conduit means 
wherein
{ HEAD ~ The method } 6 wherein { TAIL ~ the step } of injecting a flow of cold cryogen vapor includes the steps of injecting at least a first flow of cold cryogen vapor into the first conduit means , and injecting at least a second flow of cold cryogen vapor into the second conduit means
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH