E. J. Richards, J. L. Willis, and D. J. M. Williams 289 
PoweR SPECTRAK BENSITY (ARBITRARY Scale) 
200 hao Goo Bao 1a09 
Feeavency (<ps) 
Fig, 15.11. Strain spectrum at panel 5. 
°8 
O-G 
o4 
CORRELATION COEFFRICIENT 
a 6 6 
(a pe wn 
b 
Mm 
. 
) 
520 Gog 70 800 90a (aoa 
Feeauency €-p-s) 
Fig. 15.12. Correlation spectrum between panels 2 and 5. 
