54«»W 



SO'N 



44«W 

 50°N 



48" =^ 



46« 



44* 



42* 



40*N 



54*W 52* 



50* 



48* 



46* 



40*N 

 44''W 



FioriiE 4"). Field of standard deviation of dynamic liciiiht ol' the individual suivoys from tlic May 



normal. Contour level is 1 d\namir centimeter. 



51 



