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The figure will be adapted from Fig. 17 of chapter 4 in Bolton PR, Parodi K, Schreiber J. Applications of Laser-driven Particle Acceleration: CRC Press, Taylor & Francis Group; 2018 (click downloads/updates for downloading color figure files) and Fig. 3 of Albert F, Thomas AGR. Applications of laser wakefield accelerator-based light sources. Plasma Phys Contr F. 2016;58(10) .