Stellar mass-to-light functions from Taylor et al. (2011; red) and Bell et al. (2003; blue) as a function of g−i colour. We show approximate error bars of 0.1 dex for each case. The top panel shows the results for the q = 2 model, and the bottom panel shows the q = 1 model (see Eq. (6)). The blue dots show where the UDGs must lie assuming that the EMOND formulation is correct. This shows that it may be possible for most of the UDGs to be explained by EMOND within the range of stellar mass-to-light ratio allowed. The q = 1 model again shows better results.