Division of the dwarf galaxy sample into HSBs (blue points), LSBs (red points), COMPs (green points), and DIFFs (yellow points) based on their central surface brightness (μ₀) and effective radius (R_e). A distance of 72 Mpc was assumed to convert angular to physical scale. This division is stellarmass dependent and is indicated with the black dashed curve. Coloured points represent the dwarf galaxies that have been used for the analysis in this paper. Those dwarf galaxies that also satisfy the UDG criteria in μ_0,IE and R_e (μ_0,IE < 23 mag arcsec⁻² and R_e > 1.5 kpc, shown with dashed horizontal lines) are indicated with the black circles around the coloured circles. Grey points show those dwarf galaxies that have been removed from the sample after initial assessment (as was mentioned in Sect. 2.2).