A filter of {HEAD ~ the type} depicted in FIG 2 is suitable for infrared radiation in the spectral range of wavelengths from approximately 1.8 microns to {TAIL ~ 1000 microns} 
A filter of { HEAD ~ the type } depicted in FIG 2 is suitable for infrared radiation in the spectral range of wavelengths from approximately 1.8 microns to { TAIL ~ 1000 microns }
OTH 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 TAIL TAIL TAIL TAIL TAIL TAIL