deletions | additions       diff --git a/section_Water_Vapor_Calibration_The__.tex b/section_Water_Vapor_Calibration_The__.tex  index 750cf2e..a19ba70 100644  --- a/section_Water_Vapor_Calibration_The__.tex  +++ b/section_Water_Vapor_Calibration_The__.tex 
...
\usepackage{mhchem, textcomp}  \section{Water Vapor Calibration}  \\  The FTIR has relatively large measurement cell with a large surface area. Sampling lines and buffer volumes also lengthen the response time of the calibration system. The combination of the high frequency calibration requirement and the slow response times makes it impractical to perform the 2 standard calibrations that have been outlined for in-situ analysers by \citet{Bastrikov_2014}. The best approach for the FTIR is to chose a calibration strategy that reduces memory effects and enables the calibration of the humidity-isotope effects and the VSMOW scale \cite{Steen_Larsen_2013}. For the FTIR system calibrations performed every 3 hours presents a suitable trade-off between minimising the effect of instrument drift and loss of measurement time. This presents an inadequate amount of time to measure 2 standards or characterise the humidity-isotope effect over the expected H2O range for a long term-deployment. We therefore explore using the direct isotopologue calibration method introduced by \citet{Griffith_2012} and employed by \citet{Vardag_2015} for CO_2 isotope ratio measurements on a similar FTIR instrument.