TABLE I 
Distance and time covered by observations outside the grid 
Date Number of Hours Number of Miles 
o5 
5.3 
55 
06 
13.5 
131 
07 
13.3 
117 
08 
13.2 
136 
i5 
9.3 
83 
16 
13.3 
129 
17 
13.5 
108 
18 
13.3 
100 
19 
13.3 
113 
Total 
155". 2 
872 
TABLE II 
Distance and time covered by observations inside the grid 
Date Number of Hours Number of Miles 
09 
13.0 
127 
10 
12.8 
101 
11 
13.1 
132 
12 
12.9 
118 
13 
13.8 
136 
lit 
13.0 
129 
15 
Iu8 
39 
Total 
83*5 
782 
