deletions | additions       diff --git a/The_column___dryair_is__.tex b/The_column___dryair_is__.tex  index b79518f..60a4745 100644  --- a/The_column___dryair_is__.tex  +++ b/The_column___dryair_is__.tex 
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The column$_{dryair}$ VC$_{dryair}$  is calculated from the measured surface pressure (P$_s$). The effect of varying water vapour on the surface pressure can be removed by using the retrieved vertical column of H$_2$O from the spectra. column$_{dryair}$ VC$_{dryair}$  is therefore calculated as per Equation \ref{eq:col_dryair}. \begin{equation}  \label{eq:col_dryair}  column_{dryair} VC_{dryair}  = \frac{P_s}{g*\frac{m^{dry}_{air}}{N_a}} - column_{H_2O} VC_{H_2O}  * \frac{m_{H_2O}}{m^{dry}_{air}} \end{equation}  where m$^{dry}$$_{air}$ and m$_{H_2O}$ and the molecular masses of dry air and water, respectively, N$_a$ is Avogadro's number (6.022 x 10$^{23}$ molecules mol$^{-1}$) and g is the column-average gravitational acceleration.  %\begin{equation}  %\label{eq:col_dryair}  %column_{dryair} = \frac{P_s}{g * \frac{m^{dry}_{air}}{N_a}} - column_{H_2O} * \frac{m$_{H_2O}$}{m^{dry}_{air}}