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 S: CM 







gap is found 18509 — 21370 in the spark. This region con- 

 tains bands, and it ma} 7- be the reason why weak lines have 

 not been noticed. There are no means therefore of testing 

 this set. All that can be said is that the allotted F lines are 

 possible. The F 2 is linked to other lines by — 2457*59 — 

 u — 1 -05 and 963*59 = c + l'05, an example of the frequent 



