means for supporting a sample in {TAIL ~ a position} to be illuminated by the infrared radiation in either the transmission mode or {HEAD ~ the reflectance mode} 
means for supporting a sample in { TAIL ~ a position } to be illuminated by the infrared radiation in either the transmission mode or { HEAD ~ the reflectance mode }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD