Erratum: “Spectra of Hydrogen-poor Superluminous Supernovae from the Palomar Transient Factory” (2018, ApJ, 855, 2) by Robert M. Quimby, Annalisa De Cia, Avishay Gal-Yam, Giorgos Leloudas, Ragnhild Lunnan, Daniel A. Perley, Paul M. Vreeswijk, Lin Yan, Joshua S. Bloom, S. Bradley Cenko, Jeff Cooke, Richard Ellis, Alexei V. Filippenko, Mansi M. Kasliwal, Io K. W. Kleiser, Shrinivas R. Kulkarni, Thomas Matheson, Peter E. Nugent, Yen-Chen Pan, Jeffrey M. Silverman, Assaf Sternberg, Mark Sullivan, Ofer Yaron

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