deletions | additions       diff --git a/Characterisation_of_STTs.tex b/Characterisation_of_STTs.tex  index 9634e1f..705228b 100644  --- a/Characterisation_of_STTs.tex  +++ b/Characterisation_of_STTs.tex 
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In order to avoid spurious events caused by surface pollution or Fourier transform anomalies these perturbation profiles are trimmed to between 2km and 1km below the tropopause.  Now using all the trimmed filtered profiles we extract those with points above the 99th percentile(locally) of all ozone levels.  In order to remove unclear 'near tropopause' anomalies we further filter out events where the gradient between the maximum ozone peak and the tropopause minus 2km is greater than -50 ppbv/km(TODO: Check this value, -50 is a guess).  An example of this is provided in figure TODO: Update\ref{fig:BandpassEG}.