91In particular, it is incumbent upon the EU institutions to comply with both components of the requirement of impartiality, which are, first, subjective impartiality, by virtue of which no member of the institution concerned may show bias or personal prejudice, and second, objective impartiality, under which there must be sufficient guarantees to exclude any legitimate doubt as to possible bias on the part of the institution concerned (judgment of 11 July 2013, Ziegler v Commission, C‑439/11 P, EU:C:2013:513, paragraphs 154 and 155 and the case-law cited).
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