A comparison between the properties of Do I and the known dwarf galaxies of the Local Group (McConnachie 2012). Top panel: effective radius in parsecs vs. the logarithm of V band luminosity in L_⊙. Middle panel: V band surface brightness in mag arcsec⁻² vs. effective radius in parsecs. Bottom panel: V band surface brightness in mag arcsec⁻² vs. absolute V band magnitude. The V band quantities were obtained by transformations given in Fukugita et al. (1996), and the effective radius is the average of the g and r band measurements.