Hi I am using an Antminer D3.  Can someone tell me what to sell d= to?  Or should I  not have it?

On zpool home page it says to set d=92.
On their difficulty page http://zpool.ca/site/diff it says to set X11, X13, X14 and X15: from 0.002 to 0.512.

I am confused what to put :/