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. 2018 May 15;9:1917. doi: 10.1038/s41467-018-04330-5

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© The Author(s) 2018

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Fig. 2 — Speckle contrast analysis. a The mean photon density probability distribution of 3·10⁴ shots recorded at T = 296 K with pulse duration δt = 50 fs. In the inset is shown a fraction of the ePix detector for a single shot with $\bar{k} = 1.5 \cdot 1 0^{- 2}$ photons/pixel, which consists mainly of pixels with 1 photon count (green) and 2 photon counts (yellow). The solid red line depicts a Gaussian fit. b The speckle contrast β as a function of number of shots N. Here is shown the running average over 120 shots (blue) and the cumulative average (red)