How to tell? Look at what is affected. The devices are altered on one side of them. Note also, that the devices are reduced on that area, because the normal contour was shoved out of the way. On a doubled die, you would expect to see the devices widened in the center areas, not reduced on the outside edges of devices, that Machine Doubling leaves in its wake. Different types of Machine Doubling.
On a doubled die, you will spread on the centers of devices:
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