TABLE I 
Distance and tine covered by observations outside the - r id 
Date 
Number of Hours 
Number of Niles 
05 
5.3 
55 
06 
13.5 
131 
07 
13.3 
117 
08 
13.2 
13c 
15> 
9.3 
83 
16 
13.3 
129 
17 
13.5 
103 
18 
13.3 
100 
19 
13.3 
m 
V] 
J b 
Total 
108.2 
872 
TABLE II 
Distance and time covered by observations inside the 
grid 
Date 
Number of Hours Number of Niles 
09 
13.0 
127 
10 
12.8 
101 
11 
13.1 
132 
19 
12.9 
118 
13 
13.8 
136 
1 b 
13.0 
129 
15 
Iu8 
39 
Total 
5J3 
702 
