Summary plot giving evidence for the VD23 object being a bulgeless edge-on galaxy. Panel (a): two-color image of the object, i.e., of the conspicuous thin long structure in the image. Panel (b): two-color image of local galaxy IC 5249 presented at the same spatial scale and orientation as the object. The bands (NUV and g) were chosen to approximately represent the restframe wavelengths where the object was observed (F606W and F814W). Panel (c): surface brightness profiles of the object in F606W and F814W (see inset). Panel (d): surface brightness profiles of IC 5249 in NUV and g (see inset). Panel (e): position–velocity curve of the object from Fig. 10 in VD23 (thick orange line). The same curve flipped both around x = 0 (vertical dotted line) and y = 0 (horizontal dotted line) is also represented (orange dashed lines) to emphasize the symmetry of the observed position–velocity curve, as expected from the rotation of a galaxy. The rotation curve of IC 5249 was also included without any scaling or adjustment (blue solid line; the light blue region represents the noise, as provided by Banerjee & Bapat 2017). The five panels share the same x-axis with the vertical dashed lines, separated by 40 kpc, included for comparison. See Sects. 2 and 3 for further details.