Fig. 



3 4 5 6 7 8 9 10 11 12 13 14 IS 16 17 18 19 20 21 22 23 24 25 



WAVELENGTH (Microns) 



1. Blackbody distribution (Planck Law) for -2°C and +35°C a nd atmospheric attenuation 

 of 1,000 feet of air path at sea level. 



600 MOO I3O0 1200 1100 1000 



900 



800 



700 



9 10 II 12 



WAVELENGTH IN MICRONS 



Fig. 2. Filter percent transmission (upper trace shows 100$> transmission). 



62 



