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Fig. 3

image

Logarithmic column density ratios of L183 relative to L1544. Where no uncertainty was provided in the literature data (see Table B.2), an error of 25% of the reported column density was assigned for the error bars in the plot. In cases where the column density was derived for two temperatures, both ratios are shown for the same species. The red dashed line represents the ratio equal to unity.

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