Mg II

  wave(A)    loggf   Source Chi_low    log(N_Mg/Ntot)   

  4384.637   -0.776  NIST5  80619.50     -5.00  blend
  4390.514   -1.478  NIST5  80650.02     -5.20 
  4390.572   -0.523  NIST5  80650.02     -5.20 
  4481.126   +0.749  NIST5  71490.19     -5.00
  4481.150   -0.553  NIST5  71490.19     -5.00
  4481.325   +0.594  NIST5  71491.063    -5.00

 average:                               -5.06 +/- 0.09