Hello zpofrp , at the symbol instance level, a pin is "exploded" when a change is made to its physical definition that differentiates it from its description in the parent symbol definition. It could be that a pin's location, rotation, or padstack has been modified, at the symbol instance level, that differentiates it from the symbol definition. In that case, the pin in the symbol instance no longer points to its physical data in the symbol definition, but now owns its own physical data (i.e. it's physical description is "exploded" from the symbol definition) ,
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