Fits of a high latitude spectrum during winter. The black spectrum was measured with FP1 at 89°N in March 2007. The blue and red lines indicate respectively the fits of this spectrum with the haze B cross-sections as measured by de Kok et al. (2007) and with the addition of a small offset (2.5 cm^-1) to haze B cross-sections from 190 cm^-1 to 240 cm^-1. Without this correction, the continuum is overestimated by NEMESIS around the C₄H₂ band and underestimated around the C₂N₂ band.