{HEAD ~ The emitted radiation} preferably has {TAIL ~ a spectral radiant power distribution}, for which the maximum is at a wavelength in the infrared range 
preferably has
{ HEAD ~ The emitted radiation } preferably has { TAIL ~ a spectral radiant power distribution } , for which the maximum is at a wavelength in the infrared range
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH