u 



W 



—I 



170 

 160 

 150 

 140 



130 



120 



1 10 



100 



90 



80 



70 



60 



50 



40 



30 



20 



10 







AVERAGE DIVE DURATION HISTOGRAMS 

 ALL PTTS 



PERIODS 1-4 COMBINED 

 # PERIODS = 299 

 X=86 SD = 48 



0-60 



61-120 121-180 181-240 241-300 301-360 



50 



45 



40 - 



>H 35 - 

 u 



g 30 



D 



o- 25 H 



w 



g 20 ^ 

 15 - 

 10 - 



5 - 







n 



16-05:15 GMT (1) X=82 SD=44 N = 87 

 16-11:15 GMT (2) X=89 SD=54 N = 8a 

 16-17:15 GMT (3) X=88 SD=48 N = 74 

 16-23:15 GMT (4) X=81 SD=41 N = 50 



H 



\ : ^ 



a 



lE. 



n_ 



0-60 61-120 121-180 181-240 241-300 301-360 

 AVERAGE DIVE DURATION (SEC) 



Figure 55. Frequency histogram of average dive duration (seconds) during all 6-hour 

 summary periods for all 1990 PTTs (#823, #825, #827, #831, #833, #839 and #840). 

 Note: X = mean average dive duration during the designated period; sd = standard deviation 

 of the mean; N = # of summary periods from which the histogram was generated. 



90 



I 



