deletions | additions       diff --git a/why 12 gives good image but bad data.tex b/why 12 gives good image but bad data.tex  index b0d22ec..83feed9 100644  --- a/why 12 gives good image but bad data.tex  +++ b/why 12 gives good image but bad data.tex 
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To correct for the fact that \textsuperscript{12}CO is opticaly thick, we use the following equation:  \begin{equation} \label{eqn:mass-energy} Tmb_12 / Tmb_13 = [12_CO] / [13_CO] \end{equation}  Tmb,12  Tmb,13= [  12CO]  [13CO]  1−e−τ12  τ12  , * (1 - e ^ -tau_12) / tau_12\end{equation}