NUMBER OF SURVEYS 
280 
x 
9° 
80 
40 
| WINTER j SPRING | SUMMER | AUTUMN | 
Figure 5. Distribution of profile line surveys by month and season. 
Cross hatching indicates survey of profile lines 22 to 30. 
NUMBER OF SURVEYS 
Figure 6. 
140 
120 
100 
80 
40 | 
: ! 
C 196211963 119541 1955} 1966 } 1967 11968 11969! 1970! I971 11972 L1973 
Distribution of profile line surveys by year and season. 
Cross hatching indicates survey of profile lines 22 to 30. 
29 
