deletions | additions       diff --git a/Results: Events.tex b/Results: Events.tex  index 5c5cc4e..1a6bb25 100644  --- a/Results: Events.tex  +++ b/Results: Events.tex 
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\subsection{Event recognition and overlapping events}  Typical single photon events detected with the EBCCD are shown in Fig~\ref{fig1}c,d. The central peak is high with small wings, and the events are wider in the horizontal direction. Brighter, larger ion 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 (Fig~\ref{fig1}c,d, top).The data also contains some overlapping photons events (Fig~\ref{fig1}c,d, bottom left).  The ion events cause problems with event recognition algorithms that find a threshold for each frame separately; 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 by setting the intensity of all bright pixels in the ion events to a grey value slightly above the maximum intensity of the photons events. The ion events are then incorrectly localised as photon events, but the relatively rare occurrence of ion events compared to photon events (around 1 ion event / 1000 photon events ??? - check this) does not have a noticeable effect on the results. 
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