Identifying transformer leads

Hi all,
I have this Nad 216 THX toroidal transformer but I have no idea how this thing should be wired. It is 120V/230V.

Measurements:

Black-green 0,7ohm
Black-orange 0,7ohm
Green-Orange 0,8ohm

Black-gray 1,0ohm
Black-brown 1,0ohm
Black-red 2,6ohm
Gray-brown 0,5ohm
Gray-red 2,1ohm
Brown-red 2,0ohm

How to connect 230v?
 

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