Erratum: H2S in the L1157-B1 bow shock. Issue 2 (18th February 2017) - Holdship, Jonathan; Viti, Serena; Jimenez-Serra, Izaskun; Lefloch, Bertrand; Codella, Claudio; Podio, Linda; Benedettini, Milena; Fontani, Francesco; Bachiller, Rafael; Tafalla, Mario; Ceccarelli, Cecilia