49The requirement of impartiality encompasses, on the one hand, subjective impartiality, in so far as no member of the institution concerned who is responsible for the matter may show bias or personal prejudice, and, on the other hand, objective impartiality, in so far as there must be sufficient guarantees to exclude any legitimate doubt as to bias on the part of the institution concerned (judgment of 11 July 2013, Ziegler v Commission, C‑439/11 P, EU:C:2013:513, paragraph 155). It is clear from case-law that subjective impartiality is presumed in the absence of evidence to the contrary (see, by analogy, judgments of 1 July 2008, Chronopost and La Poste v UFEX and Others, C‑341/06 P and C‑342/06 P, EU:C:2008:375, paragraph 54, and of 19 February 2009, Gorostiaga Atxalandabaso v Parliament, C‑308/07 P, EU:C:2009:103, paragraph 46).
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