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Figure 2
(a) Section from a histogram of analog-to-digital units resulting from an empty beam exposure, with many detector pixels illuminated by single photons only. The vertical red line in the histogram plot marks the offset of 4 ADUs that was used to subtract the zero-photon noise. Its peak can be clearly separated from the single-photon peak at 10.8 ADUs. (b) Scattering pattern of the empty beam that was used for plotting the histogram on the left. In this image, all values below the threshold of 4 ADUs (red line in subfigure on the left) have been set to 0, corresponding to the black pixels containing no ADUs.

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