'% 



.060 



0.080 0.100 0.120 

 FREQUENCY (HZ) 



0.140 



Figure D-12. South Pass, 1540 to 1550 c.d.t., 600-second 

 record analyzed. 



0.060 0.080 0.100 0.120 0.140 



FREQUENCY (HZ) 



Figure D-13. South Pass, 1550 to 1600 c.d.t., 600-second 

 record analyzed. 



104 



