Illustration of the decomposition for three different exposures for Hα (first row) and Hβ (second row). The two components are shown in blue and green, the total model in red, and the corresponding data in black. The decompositions for all exposures are shown in Figs. C.1, C.2, C.3 and C.4 for Hα, Hβ, Hγ, and Hδ, respectively. This decomposition provides a great fit to all exposures despite the strong constraint of a constant profile.