Middle Bronze Age cities from southeastern Europe in reconstructions

Trying to hunt down tin mining and arsenic copper working souces, I happened on these nice images on Wikimedia from the Cucuteni-Tripyllia culture:

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(and a sample of the raw geomagnetical data this reconstruction is based on, from a publication of Kiel university dealing with the downfall of this culture - possibly due to the lack of participation of the population in decision-making:)

These appear to be sharing the division between an inner ring and an outer ring population, without any architectural indication that the outer ring population was less privileged than the inner ring.