Figure 6. Sea-surface dynamic topography (dynamic meters) relative to 1000 decibars, 16-24 April 1968. Arrows 

 denote sea-surface dynamic heights at intervals of 0.02 dynamic meters. Staffs of arrows are drawn perpen- 

 dicular to imaginary line segments connecting adjacent stations ; heads of arrows indicate direction of geo- 

 strophic current. Nomograph for obtaining geostrophic speed when entering with distance between 0.02 

 dynamic-meter contours assumes latitude of 45°. 



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