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The effect of photobleaching on the overall amplitude and overall phase shift (f = 12 kHz) for the dual pO2/pCO2 sensor excited with the 605-nm LED. Conditions: 1 0 kPa O2, 0 kPa CO2; 2 0 kPa O2, 2 kPa CO2; 3 12 kPa O2, 0 kPa CO2; 4 12 kPa O2, 2 kPa CO2; 5 20 kPa O2, 0 kPa CO2
