Fig. 4
From: Seeded X-ray free-electron laser generating radiation with laser statistical properties
Histograms and dispersion values of intensity in different modes of operation. a, c Histograms of probability distributions of intensity, p(I/〈I〉), for seeded (a) and self-amplified spontaneous emission (SASE) (c) regimes. The red line represents a fit by a Gamma function and the black line represents a fit by a Gaussian function. Number of modes determined from the Gamma distribution is indicated by M. (b, d) Contrast behaviour as a function of inverse bandwidth for seeded (b) and SASE (d) regimes of operation
