Erratum: A streak camera study of superfluorescence at multiple wavelengths from helium atoms excited using free electron laser pulses (2015 J. Phys. B: At. Mol. Opt. Phys.48 105002). (26th June 2015) - Harries, James R; Iwayama, Hiroshi; Nagasono, Mitsuru; Togashi, Tadashi; Yabashi, Makina; Kuma, Susumu; Nakajima, Kyo; Miyamoto, Yuki; Ohae, Chiaki; Sasao, Noboru; Shigemasa, Eiji