mode 1n1 = 4.2 – 4.5 Hz

mode 2n1 = 4.8 – 5.0 Hz

mode 3n1 = 22.7 – 22.8 Hz

11 12 13 14

2

3

4

5

6

7

8

9

time (h)

freq

uenc

y (

Hz)

Shu 04 20060331 103142, ch: 1

-8

-7.5

-7

-6.5

-6

-5.5

-5

-4.5

-4