. OS56- 

 •0.6a7- 



-O 79e- 



S-COLUMN 



d-COLUMN f-COLUMN 



K =3 K =4 



Fig. 6 — Diagram of the stationar>' states of sodium, sorted out into columns by 



applying the selection-principle. Arrows represent various lines (blue for principal, 



yellow for sharp, red for diffuse and green for Hcrgniann scries) 



