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zbabs: EUV ISM attenuation

The ISM attenuation due to neutral H, neutral He and once ionized He. This is a modified version of the Rumph, et al. 1994 model, using the ismatten program by Pat Jelinsky, and allows the user to set the model redshift.

 par1       nH: H column density (1022 atoms/cm2)

 par2      nHeI: HeI column density (1022 atoms/cm2)

 par3      nHeII: HeII column density (1022 atoms/cm2)

  par4       z: Redshift