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(a, b) Two-dimensional cumulative histograms of 
versus
for two different operation configurations from 105 shots. The color bar indicates counts. (c, d) Corresponding distributions of pulse intensity asymmetry 
= 
within the summed-pulse intensity regime as approximately illustrated by the dashed area, which corresponds to the 
signal level within the [0.22, 0.52] range as indicated by the red area in Fig. 2(c) ▸.
