Comparison of the mass of the polytropic sphere with the mass of pseudo-isothermal model for each tested dwarf galaxy. Each point is accompanied by a number in brackets representing the dwarf galaxy (see Table 1 for the name). The cases where the polytrope model has a lower value of the χ² test compared to the pseudo-isothermal model are depicted as red points, while the blue points indicate a better fit of the pseudo-isothermal model. The black line corresponds to the line of equality. The bottom figure is just a zoomed view of the top figure.