"I I n I \ I — rr 



95% 



CONFIDENCE 



LIMITS 



t I 



2237-2322 i 



0345-0430 Z 

 0430-0515 I 



1435-1520 Z 



1350-1436 Z 



- — PERIOD (SEC) 

 100 50 30 20 15_ 



.01 ,02 03 04 .05 .06 .07 



FIGURE 5 Power spectra of micropressuce wave records taken during 5 and 6 July 1 961 . 

 Spectra are computed separately for each half of the 90-minute records. 

 Spectra are not corrected for instrument response. 



