10,000 



5,000 



2,000 



1000 



500 



200 



100 



50 - 



20 



10 



LOG U(h) = -5/3 LOGfO + a 

 SLOPE -1.67 



n 



0.01 0.02 



0.05 0.10 0.20 



FREQUENCY (CPM) 



0.50 



1.00 



Figure 35. Power spectrum from successive half-minute readings of the depth of 19 C 

 isotherm (Section Q). The slope —5/3 in the log-log plot is indicated as well as the 

 slope (—1 .356) estimated from the power spectrum. 



66 



