A THEORY OF SCANNING 



509 



F'-O.l 



-2.0 -1.8 -1.6 -1.4 -1.2 -1.0 -0.8 -0.6 -0.4 -0.2 0.2 0.4 06 



N N~ 



-1.0 -0.8 -0.6 -0.4 -0.2 0.2 0.4 0.6 0.8 1.0 1.2 I.. 



n'=Il 1 

 N N" 



0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.. 



n 



Fig. 23 — Rectangular aperture with no overlap. 



