13 12 II 10 



8 7 6 5 4 3 2 1 



100 - 



200 - 



if) 



UJ 



I- 



LU 



300 



Q_ 

 LlI 

 Q 



400 



600 



500 - 



S 8' 



2° 0° 2° 



LATITUDE 



8° N 



Figure 13. --Inorganic phosphate in microgram-atoms per liter, 110°W. longitude. 



61 



