Table 1: Comparison of centroid wavelengths (Å) for the K$\alpha $ and K$\beta $ unresolved transition arrays in Fe ions with $17\leq N\leq 25$. The HFR wavelengths have been weighted with the fluorescence yields. Experimental wavelengths for Fe  X (N=17) are from Decaux et al. (1995) and for solid-state iron from Hölzer et al. (1997).
  HFR   Expt
N K$\alpha $ K$\beta $   K$\alpha $ K$\beta $
17 1.9369 1.7488   1.9388(5)  
  1.9407 1.7493   1.9413(5)  
18 1.9366 1.7511      
  1.9402        
19 1.9364 1.7527      
  1.9403        
20 1.9362 1.7540      
  1.9405        
21 1.9360 1.7557      
  1.9404        
22 1.9357 1.7566      
  1.9400        
23 1.9355 1.7565      
  1.9397        
24 1.9356 1.7565      
  1.9398        
25 1.9356 1.7566   1.936041(3) 1.756604(4)
  1.9398     1.939973(3)  


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