276 



BELL SYSTEM TECHNICAL JOURNAL 



0.0040 



0.0036 



Z 0.0024 



Li. 



o 



5 0.0020 



< 



< 0.001 6 



z 



0.0008 



0.0004 



s'=o — ^^: '===^^^= 



If) 



z'o.06 

 O 



a 0.04 

 < 



Q. 



V 



<0.02 



\ 5 ^6 



VALUES OF r 



Fig. 5 — Imaginary part of Ni{r', s'). 



S=0 ' ^^^ ::^^^= - " 



04 0.8 1.2 1.6 2.0 ,2.4 2.8 3.2 3.6 4.0 



VALUES OF r 



Fig. 5-A — Imaginary part of N\{r', s'), enlarged horizontal scale. 



