From the top to the bottom row: effective radius R_e, mean effective surface brightness in r-band , and Sérsic index n of our dwarf sample, as a function of total r-band absolute magnitude M_r. Left panels: individual galaxies, right panels: running means, for both populations. We use a fixed number of elements in each bin to get the local mean, N = 40 for red dwarf population, and N = 10 for blue dwarfs. Blue triangles and dashed lines correspond to the blue population of galaxies, while the red dots and solid line are the red dwarfs. The shaded areas correspond to two standard deviations of the points using the same running mean. Effective radius and Sérsic index panels are in logarithmic scale. Average error bars are shown for different magnitudes.