How to span a Window between two displays in Yosemite 10.10.2?

I

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How to span a window between two displays in Yosemite 10.10.2

What I'm trying to do :
To span ONE picture at same time on six screen.
(for that I'm using two Triplehead2go Digital SE)
What is already working : span one picture on the first couple of three screen and one picture on the second couple of three screen.

The explanation you proposed in Maverick (Uncheck the box marked Displays have separate spaces.) doesn't work with Yosemite.
 

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