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There are multiple causes that can trigger PARA-006 errors. Here is a checklist.

1) SPEF reading order

Functionally, the parasitic files can be read in any order. For best stitching performance, however, it is recommended that you read in the topmost file last.

For example, suppose that you read the top level SPEF first, as follows: 

read_parasitics –verbose top.spef
re