100 



200 - 



UJ 



H- 

 UJ 



300 



Q. 

 UJ 

 Q 



400 



600 



500 - 



S 8' 



2° 0° 



LATITUDE 



6° N 



Figure 18. --Inorganic phosphate in microgram-atoms per liter, 120°W. longitude. 



66 



