If a sufficiently fine-grained common cause variable is specified—one that captures the shared physical process within the overlapping region—screening off is restored in principle.

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Common cause variable(in causation and statistics): A single factor or event that explains why two seemingly unrelated things happen together. For example, rain is a common cause that explains why both the sprinkler is off and the grass is wet.
Overlapping region(in physical or conceptual space): The area or aspect where two different things meet or influence each other. Think of it like the overlap in a Venn diagram where two circles intersect.
fine-grained(Ontology of properties and criteria of individuation): Descriptive of individuation criteria or entities that make more distinctions; hyperintensional conditions are paradigmatically fine-grained
screening off(Principle of the common cause; challenged by Cartwright and Chang): A common cause screens off the correlation between its effects when, conditioned on the common cause, the effects become probabilistically independent

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