24 c 



23 c 



22 c 



21° 

 N 



DEEP ISOTHERM 

 SLOPE, U(h) 



20 c 



113° W H2 C 



m c 



110 c 



109 c 



107 c 



106° 



Figure 38. Geographic distribution of slope of power spectrum curve from successive 

 half-minute readings of isotherm depth below the main thermocl'tne (deeper i sotherm) 

 (frequencies 0,05 to 0.30). 



71 



