{HEAD ~ A monitoring apparatus} for monitoring a composition of a breathing gas mixture comprising {TAIL ~ a first gaseous component} and a second gaseous component, said monitoring apparatus comprising: 
comprising
{ HEAD ~ A monitoring apparatus } for monitoring a composition of a breathing gas mixture comprising { TAIL ~ a first gaseous component } and a second gaseous component , said monitoring apparatus comprising :
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH