{HEAD ~ The humidity sensor} associated with {TAIL ~ the monitoring} of humidity levels in the selected gas component may then be omitted and a value of the predetermined humidity level provided directly 
{ HEAD ~ The humidity sensor } associated with { TAIL ~ the monitoring } of humidity levels in the selected gas component may then be omitted and a value of the predetermined humidity level provided directly
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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