Fig. 5: Representative eigengraph waveforms generated through the empirical experiments on the automobile exhaust gases.
From: Data-centric artificial olfactory system based on the eigengraph

a CO. b CO2. c NO. d NO2. e Gasoline exhaust gas (including CO(5.01%), CO2(14.0%), C3CH8(0.20%)). f Diesel exhaust gas (including NO(0.18%), CO(4.98%), CO2(14.0%), C3CH8(0.20%) and O2(1%)). g, CO + CO2. h CO + CO2 + NO.