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=![]() |
H column density (![]() ![]() |
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HeI column density (![]() ![]() |
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HeII column density (![]() ![]() |
par4=z | redshift |