deletions | additions       diff --git a/Results.tex b/Results.tex  index 1915195..a801749 100644  --- a/Results.tex  +++ b/Results.tex 
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Typical single photon events detected with the EBCCD at 8 kV acceleration voltage and maximum read-out gain are shown in Fig~\ref{fig1}. The central peak is high with small wings, and the events are wider in the horizontal direction. Brighter, larger events are also detected, caused by a photoelectron hitting a gas molecule in the imperfect vacuum inside the EBCCD tube, leading to the gas molecule being ionised and accelerated towards the photocathode.  Ion events cause problems with event recognition algorithms that find a threshold for each frame separately, where the high brightness causes the threshold to be set too high and the photon events discarded as noise. The raw data was therefore preprocessed using ImageJ's tools: the intensity of all bright pixels in the ion events was set to to a grey value slightly above the maximum intensity of photons events. The ion events are then counted as photon events, but the relatively rare occurence of ion events compared to photon events (around 1 ion event / 1000 photon events) does not affect the final image resolution.  \begin{itemize}  \item Ion events  \item Multi-emitter fitting analysis 
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