Classification of the sample adapted from Sprayberry et al. (1995), Hagen et al. (2016). The squares symbols represent the value of the disk fit for the inner part of the galaxies and the cross symbols for the extended UV region. The blue line distinguishes the Low Surface Brightness (LSB) galaxies from the Giant LSB (GLSB) galaxies. The orange line, which represents the Freeman (1970) value (21.65 mag.arcsec⁻²), separates the high surface brightness (HSB) galaxies from the LSB galaxies. In order to compare with the data of McGaugh & Bothun (1994), Sprayberry et al. (1995), and Hagen et al. (2016) (black dots) calculated with H₀ = 100 h km s⁻¹ Mpc⁻¹, we corrected the Scalelength with h⁻¹.