Cholesterol, Cg^H^^OH 



X-rayed in vacuum 

 (indicating the top curve) 



X-rayed in air 

 (indicating the bottom curve) 



Fig. 13. Resonance (first derivative curve) of cholesterol at 2.7 kMc, x-irradiated 

 in a vacuum (upper figure) and in air (lower figure). (From H. N. Rexroad 



and W. GoRDY (24).) 



