Kinematical modelling performed on SDSS J0923+0247. Upper panels [a.1] and [a.2]: fit result of the flux map, bottom panels [b.1] and [b.2]: result of the 2D velocity field fit. [a.1]: curve of χ² minima as a function of the disc inclination (see Sect. 4.2 for details). The magenta hexagon indicates the absolute minimum (=35 deg) of χ_m(β). The green area (see Sect. 4.3 for the definition) indicates the allowed inclination values used as a prior in performing a 2D velocity field fit. [a.2]: 2D best-fit model of the flux map. From left to right, we report the observed map, the model, and the residuals ([data-model]/error). Residuals values are color-coded according to the horizontal colorbar displayed at the bottom-left corner of the panel. [b.1]: the posterior probability distributions of the free parameters in 2D velocity field fits retrieved with the MCMC algorithm with the best values and their uncertainties. [b.2]: 2D best-fit model of the kinematical map. From left to right, we report the observed velocity map, the model, and the velocity curves extracted from a long-slit of two pixels in width aligned with the line of nodes. The slit is superimposed on maps; red circles and solid black lines in the right panel indicate the observed flux-weighted velocity values in each bin of the slit and the model, respectively.