FIG 3 (IMAGE) Compuscript Ltd Caption Concentration test results of the C2H2-LITES sensor. (a) 2f signal when using commercial QTF. (b) 2f signal when using trapezoidal-tipped QTF. (c) Concentration linear response when using commercial QTF. (d) Concentration linear response when using trapezoidal-tipped QTF. Credit OEA Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.