43Further, the 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 the institution concerned must offer sufficient guarantees to exclude any legitimate doubt as to any possible bias (see judgments of 11 July 2013, Ziegler v Commission, C‑439/11 P, EU:C:2013:513, paragraph 155; of 20 December 2017, Spain v Council, C‑521/15, EU:C:2017:982, paragraph 91; and of 27 March 2019, August Wolff and Remedia v Commission, C‑680/16 P, EU:C:2019:257, paragraph 27).
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