TABLE I 
Distance and time covered by observations outside the grid 
R&te No . Hours ' No. Miles 
01 
10.9 
110 
02 
13.4 
125 
03 
13.3 
112 
04 
13.1 
113 
06 
12.8 
128 
07 
12.6 
84 
14 
15.1 
35 
15 
13.1 
121 
16 ' 
13.3 
78 
17 
13.2 
91 
18 
13.2 
121 
19 
5.9 
47 
Total 
147.9 
1184 
TABLE II 
Distance and time covered by observations inside tbe grid 
Date No. Hours No. Miles 
05 
12.9 
123 
08 
12.8 
72 
09 
13.1 
124 
10 
12.9 
70 
11 
13.0 
106 
12 
13.1 
123 
13 
13.0 
77 
Total 90VS £9.5 
