Substituting "Eb" for the accuracy of "b" in the first equation and 

 squaring both sides gives 



E V - hJ. [*] [i-a/. 



Note that £(x) is equivalent to nx, so 



.2 s,.2 , 2) 



2 



b nx 



N/ 



s. 2 



To simplify, let y ' x = C , then 



b 2 x 



e 2 - e_ it 2 ] (i - s 



2 2 



or n = t C 



2 t 2 C 2 



This is the formula upon which table 1 is based. 



-5- 



