N 





Figure 2. A hypothetical subunit depicting one day's flight path. On this day, it was 

 randomly determined that (1) sampling would start at the southern boundary, (2) sampling 

 would begin at nautical mile number 2, (3) the first leg would be 222 km (120 nmi) in 

 length, and (4) the first leg would be flown at an altitude of 228 m (750 ft). The starting 

 point and beginning altitude for replicate days would also be randomly chosen, but the 

 order of long and short transect legs would change systematically to insure that 222 km 

 transects were conducted in all possible positions in the subunit. On all days, altitudinal 

 coverage was amplified by flying at 91 m (300 ft) on one leg of each round trip and at 228 

 m (750 ft) on the other. 



