Black line in interferogram

Hello, does anyone know the reason for the black line in the overlaps in the same way?
In all interferences this way؟ :point_down:

did you apply topographic phase removal during the interferogram formation and based on which elevation data?


can you please try to download a DEM and use it as an external DEM?
These triangles were reported in various cases, yet their source is unclear.

Thank you very much