Figure 10: Effect on zero baseline temperature of LED temp of LED concentration / ppm detection channel reference channel S / AU conc equivalent 10°C 10 0 1.76E+04 8.12E+03 6.49E-02 5.43E+03 15°C 15 0 1.72E+04 7.68E+03 3.30E-02 2.76E+03 20°C 20 0 1.65E+04 7.16E+03 0.00E+00 0.00E+00 25°C 25 0 1.59E+04 6.65E+03 -3.54E-02 -2.96E+03 30°C 30 0 1.54E+04 6.28E+03 -6.49E-02 -5.43E+03