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Configuration (1): (a) Histogram of the reduced electron beam energy 
= 
where 
= 13478 MeV. (b, c) Two-dimensional cumulative histograms of the first and second pulse intensity 
and 
as a function of the the reduced electron beam energy from 105 shots. Configuration (2): (d, e, f) The same quantities as given in (a, b, c), respectively, for this configuration. The color bar indicates counts and the dashed lines the averaged of the distributions.
