Tolerances of stock bed?

I see this wave in my Heightmap. The Corners looking ok for me for now. I checked all rails and refastened them from one to the other side. No change 😦
It looks like the bed has this wave itself. I checked the bed like this.
What are the default tolerances which would be ok for the bed? Is this a reason to ask for an exchange? Or should i proceed with heater and magnet etc?
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