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  \textbf{Keywords:} Single photon counting, single-molecule localisation, electron-bombarded CCD  \textbf{OCIS codes:} (040.3780) Detectors: Low light level,   (030.5260) Coherence and statistical optics: Photon counting,   (100.6640) Image processing: Superresolution,   (110.0180) Imaging systems: Microscopy,  (170.2520) Medical optics and biotechnology : Fluorescence microscopy