Nikon D6 Reference Manual page 366

Flicker reduction
Flicker reduction setting
Flicker reduction indicator
Auto bracketing
Multiple exposure
HDR (high dynamic range)
Silent live view photography
1 The number of shots is reset to zero. The bracketing increment for
exposure, flash, and white balance bracketing is reset to 1. The
amount for the second shot in two-shot ADL bracketing programs is
reset to [Auto].
2 If a multiple exposure is currently in progress, shooting will end and a
multiple exposure will be created from exposures recorded to that
point. If [On (series)] or [On (single photo)] is selected, the multiple
exposure mode will be reset to [Off]. [Number of shots], [Overlay
mode], [Save individual images (NEF)] and [Overlay shooting] are
not reset.
3 [On (series)] and [On (single photo)] are reset to [Off]. [Exposure
differential], [Smoothing], and [Save individual images (NEF)] are
not reset.
314
Two-Button Reset: Restoring Default Settings
Option Default
Disable
On
Off
1
2
Off
Off 3
Off