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lyman: Voigt absorption profiles for H I or He II Lyman series

This model calculate the Voigt absorption profiles for the H I and He II Lyman series.

 par1       n: H I or  He II column density (1022 atoms/cm2)

 par2      b: b value (km/s)

 par3      z: Redshift

  par4       ZA: Atomic number of species being calculated