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Table 6

Sums of monthly mean number of groups over the wings and lengths of wings (in years).

Wing WN Length Wing WS Length

8N 235.7 12.3 8S 199.7 11.4
9N 271.9 15.9 9S 219.2 15.3
10N 215.8 11.6 10S 230.5 11.8
11N 12.8 11S 15.0
12N 157.2 12.7 12S 202.6 13.7
13N 232.0 11.7 13S 274.5 14.4
14N 200.3 15.4 14S 206.9 18.5
15N 287.6 12.8 15S 250.4 11.0
16N 262.4 14.9 16S 228.8 12.7
17N 317.8 12.4 17S 321.1 13.4
18N 359.2 11.9 18S 361.7 13.1
19N 503.8 11.8 19S 367.4 14.0
20N 404.5 14.2 20S 325.8 13.9
21N 287.2 14.4 21S 294.9 14.2
22N 244.7 13.5 22S 286.7 14.4
23N 213.8 12.3 23S 241.7 12.9

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