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