Christopher renamed 12 vs 13 CO.tex to start of 12 vs 13 CO.tex  about 10 years ago

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\section{\textsuperscript{12}CO compared to \textsuperscript{13}CO}  In comparing the results obtained in observations in \textsuperscript{12}CO and \textsuperscript{13}CO, we first need to determine which limits are appropriate. The assumption that both are optically thin, but we will show here that this is not correct. \textsuperscript{13}CO appears to be acceptably thin, but observations in \textsuperscript{12}CO are useless without a correction for optical thickness. We will show suggest such a correction and show its correctness.  \subsection{\textsuperscript{12}CO is optically thick}  A comparison between \textsuperscript{12}CO and \textsuperscript{13}CO when we assume \textsuperscript{12}CO is optically thin can be seen in the two following graphs