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25) IPC-2581A .xml (see note 25) PCB assembly pin x-y,netlist,trace (see note 25 / 1b) y IPC-D-356 (see note 18) IPC-D-356 varies (see note 18) PCB assembly pin x-y,netlist (see note 18 / 1a) y Keysight ADS (see note 7) x-y centroid varies (see note 7