Modeling the spatial distribution of the T Pyx remnant. Left panel: three-dimensional reconstruction of the T Pyx remnant using the spatial resolution provided by the MUSE-WFM and using the radial velocity from the Hβ emission line as a proxy for the third dimension. The projection onto the corresponding 2D planes is shown with the gray data. Each single data point corresponds to a single bin resulting from the Voronoi tessellation algorithm described in Sect. 3. It is visible how the external remnant is arranged as a non-uniform thick ring, with inhomogeneities marked by the different flux intensities of the line (reported here with different colors). The line-of-sight direction is perpendicular to the X − Y (pixel–pixel) plane, and here it is shown as pointing to the top of the figure. Right panel: reference frame used to model the remnant of T Pyx and to recover the transformation equations described in Eq. (4), shown in black, with the observer’s line of sight located along the Z axis. The intrinsic remnant reference frame is reported with gray coordinates and a gray frame. The inclination (i) and position angle (PA) are also shown to help to reconstruct the projected model.