Observation of an isolated barred galaxy. On the top panel, we show the gas distribution in the 3D space and define the definition of the observation angles ϕ and θ. On the middle panel, two 2D projections are shown for an inclination of θ = 40°. On the left (resp. right ) we show an azimuth of ϕ = 0° (resp. ϕ = 90°) which corresponds to an observation parallel (resp. perpendicular) to the bar. With red circles, we mark a 3″ spectral fibre observation situated at a redshift of z = 0.05. On the bottom panels, we show the gas emission line line-of-sight distribution inside the fibre. We fitted a double and single Gaussian function to the emission lines.