How to limit vertically the extent of an OpenLayers map?

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When I pan north, the map goes out and I see the white background of my HTML. I want to pan vertically and the map to block when it reaches the top (or bottom, respectively).

I have tried to put bounds, but this solution puts also bounds horizontally. I want to be able to pan infinitely left or right, but limit the panning up and down.

How could I do this?

Thanks

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