Model population ratio as a function of the energy level at 250 km (orange connected dots) and 666.1 km (blue connected dots) in the atmosphere. In the top of the figure, the ϒ_ij data used in each model are marked. The upper level determine the ϒ_ij data used. For example, for transition 24–38 (71 097 Å), the SEA&VRM data were used in model 1401b (in purple) and DW data were used in model 1401c (in red).