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This is related to conversation in the following thread: https://forum.step.esa.int/t/terrain-flattening-output-dependent-on-the-subset-size/29450/17
The changes align the subset DEM grid and its facets to be consistent during RTC of different images, as well as subsets of the same image. This should result in consistent use of the same underlying DEM data across multiple processing runs with different images / subsets.