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Electrode impedance of alumina and Parylene bilayer coated wired arrays over time. Only 25 out of 50 tip impedances were shown due to the limited space. Median impedance was 60 kΩ. The impedance stayed almost the same for each electrode over the first 120 days at 37 °C, and increased ~ 2.5 times (calculated from median impedance) after 960 days of soak testing in PBS.
