160° 159° 158° 157° 156° 155° 154 



159° 158° 157° 156° 155° 154° 



23' 



-22" 



. -^^^ -200 "-, 



,^/,40^ L/" 



180 

 -20C 



20° 



21' 



280 



300 

 280/ 



/ / . 260^„„ 

 -, , ^ y ^80 



—280 



.^260 

 240 



Fig. 18.--H. M, Smith cruise 10, Topography in meters of 23. 2, 24.0, 

 25.0, and 26,0 sigma-t surfaces. Contour interval 20.0 meters. A. 

 23.2, B. 24.0, C. 25,0, and D. 26, sigma-t surfaces. 



AO 



