The story ”That's no laser, it's a particle accelerator” (Nature 443, 256; 2006) incorrectly stated that the device described could accelerate electrons to 0.15% of their initial speed. That number actually refers to the change in kinetic energy of the electron bunches.
The online version of the original article can be found at 10.1038/443256b
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Correction. Nature 443, 383 (2006). https://doi.org/10.1038/443383b