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12 vs 13 [1].tex  figures/Optically thin, 13, den/Optically thin, 13, den.png  12 vs 13 [2].tex  figures/04970/04970.png  figures/1/1.png  12 vs 13 [3].tex  figures/Optically thick, 13, den/Optically thick, 13, den.png