Figure 4.1.10 Voyage days and Escort days for the 25BC as average of 1957-1990 at S-route;7330NM

　

Figure 4.1.11 Voyage days and Escort days for the 40BC as average of 1957-1990 at N-route;7196NM

　

Figure 4.1.12 Voyage days and Escort days for the 50BC as average of 1957-1990 at N-route;7196NM

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