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