Keywords: class

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## Parameters of the multiplet

When selecting the HFS method, you must give the name of a file that contains the relative positions and intensities of the components of your multiplet:
`LAS> method hfs hfs-n2hp.dat`
Relative intensities may be normalized or not. Here follow two examples, for the NH multiplet.

      7               ! 1st line: Number of components
       6.9360  1.     ! 1st column: Velocity shift, for each component,
       5.9841  5.     !             (in km/s) with respect to the reference
       5.5452  3.     !             component you choose (here the 5th one).
       0.9560  5.     ! 2nd column: The relative strength of each component.
       0.0000  7.     !             Here, they are not normalized.
      -0.6109  3.     !
      -8.0064  3.     !

      7                  ! As before.
      14.9424 1./27.     ! The reference velocity is now that of the last
      13.9906 5./27.     ! component.
      13.5516 3./27.     ! The intensities are normalized (you could also
      8.9624  5./27.     ! put numerical values rather that fractions).
      8.0064  7./27.     !
      7.3955  3./27.     !
      0.      3./27.     !

Let us call and the positions and relative intensities of the components of the multiplet. We define . In the first case, we thus have and .