1180 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 195J: 



0.5 



0.3 



0.2 



0.5 I.O 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 I 6.0 



RADIUS ^° 



Fig. 9(d) — See Fig. 9. 



