Thick black line: TEXES spectrum of Mars in the vicinity of H₂O₂ and CO₂ lines around 1241.58 cm^-1 (March 1, 2014, Ls = 96°), integrated over Region A (9 pixels), compared with synthetic spectra. The continuum fluctuation in the TEXES data was corrected by using the continuum on each side of each line and assuming a straight line between these two points. The airmass is 1.20. Models: H₂O₂ = 15 ppbv (green), 20 ppbv (red), 25 ppbv (blue). The best fit is obtained for H₂O₂ = 20 ppbv.