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The offline tool hark (also on github) can be used to find and download data from the cloud.

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redden: interstellar extinction

IR/optical/UV extinction from Cardelli et al. (1989). The transmission is set to unity shortward of the Lyman limit. This is incorrect physically but does allow the model to be used in combination with an X-ray photoelectric absorption model such as phabs.

par1 E(B-V)