Use ModTran (link in Canvas Pages) to match the greenhouse gas with the approximate spectral region in which it absorbs (and emits) light. In ModTran, turn off (ie. set to zero) all the greenhouse gases and turn them on and off one at a time, using their default settings. The default parameters are 400ppm CO2 ; 1.7ppm CH4 ; 28ppb tropospheric O3 ; Stratospheric Ozone scale = 1 ; water vapor scale = 1; Freon scale = 1 Ground Temperature Offset = 0 C ; hold water vapor as a constant pressure (not constant relative humidity) Locality: Tropical Atmosphere with No Clouds or Rain The sensor is looking down from an altitude of 70km