Model-based evaluation of the performance of a CF-GS. Suppose we have a CF-GS device whose catalyst exhibits selectivity k i /k a = 4 and with residence time k i r = 4. Fig. shows the consequent (of the input distributions in Fig. in the partial pressure of the analyte, P 0 a -P 0 a , by this CF-GS. The distribution of P 0 a -P 0 a is approximately centered at zero, meaning the sensor is approximately unbiased . The error emanates from both (i) the measurement noise and (ii) variance in the partial pressure of the interferent (and its contribution to the response of the sensor). The performance metric of this CF-GS in this sensing environment, given in eqn. 7, is obtainable from the PDF in Fig. .