Nikon D6 Reference Manual page 787

Dual-Format Recording PB Slot
Choose the slot from which dual-format pictures recorded with
[RAW Slot 1 - JPEG Slot 2] or [JPEG Slot 1 - JPEG Slot 2]
selected for [Role played by card in Slot 2] in the photo
shooting menu are played back.
Filtered Playback Criteria
Choose the criteria used to choose the pictures displayed
during filtered playback ( 0 427).
Image Review
Choose whether pictures are automatically displayed in the
monitor immediately after shooting. If [Off] is selected, pictures
can only be displayed by pressing the K button.
G button U D playback menu
G button U D playback menu
G button U D playback menu
D The Playback Menu: Managing Images 735