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The absorbance spectrum of a model Archaen marine environment composed of 330 mg of carbon per liter HCN polymer, 1 mM SH−, 0.5 M NaCl, 1 mM NaBr, and 50 mM MgCl2. The contribution from NaCl, NaBr, and MgCl2 is approximately equivalent to the absorbance of modern seawater.
