Depth of soil (cm)

r for N = 7000

r for N = 3500

(12 a.m.)

r for N = 3500

(12 p.m.)

5

0.93

0.93

0.89

10

0.93

0.95

0.89

20

0.87

0.93

0.87

30

0.63

0.91

0.53