a) Plan view of modelled nova ejecta with an axis ratio of 1, the shell is smooth with uniform emission. b) Plan view of modelled nova ejecta with an axis ratio of 1.4, inclination of the system is such that the accretion disc is face-on to the observer, the shell is smooth with uniform emission. c) Relative velocity diagram of the observed Hα (black) structure and the two modelled systems created in XS5. The red line represents the system with an axis ratio of 1, the blue line represents the system with an axis ratio of 1.4. The difference between the modelled and observed line profiles is given in the lower part of the diagram.