The method 1 wherein the first, second and third paths define {TAIL ~ a central window portion} having {HEAD ~ a solid radiation conducting path} between an upper and lower portion thereof 
The method 1 wherein the first , second and third paths define { TAIL ~ a central window portion } having { HEAD ~ a solid radiation conducting path } between an upper and lower portion thereof
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH