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. 2020 Mar 19;10:5054. doi: 10.1038/s41598-020-61926-y

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Speckle patterns measured from the static sample with the split-and-delay unit configured in upper branch (UB), lower branch (LB) and both branches (BB). For these measurements, the delay was set to 20 ps. (b) Speckle contrast β as a function of the mean photon FEL pulse intensity taken with the upper, lower and both branches, respectively. (c) Observable contrast for upper, lower, both branches, respectively. Solid lines are Gaussian fits to corresponding speckle contrast distributions.