24 



23 c 



22° 



21° 

 N 



DEEP ISOTHERM 



0.30 

 U B = f U(h)df 

 0.05 



20° 



113° W 112 c 



in c 



no c 



109 c 



107 c 



106° 



Figure 34. Geographic distribution of the integrated power spectrum of frequencies 

 between 0.05 and 0.30 cpm from successive half-minute readings of isotherm depth 

 below the main thermocl ine (deeper isotherm). 



64 



