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. 2016 Jun 17;7:11898. doi: 10.1038/ncomms11898

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Waterfall plots of peak charge density as a function of electron energy for an argon pressure of 2 Torr (a), 4 Torr (b), 8 Torr (c), 16 Torr (d) and 32 Torr (e). Each waterfall plot shows 50 consecutive shots taken under the same experimental conditions (except for e, where only 40 shots are presented).