Ca II
  
  wave(A)    loggf    Source    Chi_low     log(N_Ca/Ntot)

  3933.663  +0.135    NIST5      0.00         -5.6       
  3968.469  -0.180    NIST5      0.00         -5.5        
  5019.971  -0.280    NIST   60611.28         -5.5  blend        

  average                                     -5.53 +/-0.04