deletions | additions       diff --git a/figures/fig1/caption.tex b/figures/fig1/caption.tex  index 474c800..6cdcabf 100644  --- a/figures/fig1/caption.tex  +++ b/figures/fig1/caption.tex 
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\label{fig1} (a) Schematic diagram of the data acquisition setup. (b) Total imaged area of USAF test pattern. (c) An 80$\times$80-pixel area of a raw data frame with single-photon events. events and an ion event.  (d) 3D representation of (c).