1,000,000 



500,000 



100,000 

 50,000 



10,000 



5,000 



1,000 



t 1 1 1 1 r 



FREQUENCY, CPM 



Figure 18. Power spectrum computed from successive half- 

 minute interval readings of depth of 9°C isotherm, leg two, 

 cruise 2. 



31 



