Normalised contribution functions for the atmospheric emission of HAT-P-1b in the K_s-band and the different IRAC channels, using the same colour scheme as in Figs. 8 and 9, although the different linestyles are now used for different bands. The distribution functions are normalised by their sum. The left panel shows the contribution functions for the non-inverted model from Fortney et al. (2008), the middle panel shows the contribution functions for the models with both a troposphere and an inversion layer, and the right panel shows the same for the ad-hoc temperature inversion used in Todorov et al. (2010).