The non volatile memory may comprise a disk drive or read only memory device which stores a program to implement the above control and store appropriate values for {HEAD ~ comparison} with {TAIL ~ the process variables} as is well known in the art 
with
The non volatile memory may comprise a disk drive or read only memory device which stores a program to implement the above control and store appropriate values for { HEAD ~ comparison } with { TAIL ~ the process variables } as is well known in the art
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 HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH