Nikon D5 - Manual (Page 82)

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At the default setting of MTR > under > over ( H), exposure, flash,
and white balance bracketing are performed in the following
order: the unmodified shot is taken first, followed by the shot with
the lowest value, followed by the shot with the highest value. If
Under > MTR > over (
I) is selected, shooting will proceed in
order from the lowest to the highest value. This setting has no
effect on ADL bracketing.
e7: Bracketing Order
G button
➜ A Custom Settings menu