A method of automatically milking a dairy animal, in particular a cow. The washing method is effective for removal of capping-related impurities, and surprisingly does not result in decomposition of the capped poly. The apparatus comprises a first circuit with a voltage control device connectable to two first electrodes arranged along a channel holding the sample and a second circuit with a conductivity detection device connectable to two second electrodes arranged in the channel. Then, the change of machine settings for the first lithographic projection apparatus, needed to minimize the difference, is calculated and applied to the first lithographic projection apparatus such that the match between the first and second lithographic projection apparatus of any pitch-dependency of feature errors is improved. to a material object via a kiosk, the Internet, a personal computer or other electronic system. In yet other embodiments, rows of holes are provided to supplement the airflow.