Comparison between the measured line-of-sight velocity dispersion of the sample UDGs (grey error bars and/or shaded area) and the MOND prediction with EFE at the average distance d_mean for different values of the stellar mass-to-light ratio M/L, assuming a radially biased anisotropy β = +0.5. The fiducial M/L ratio from Table 1, the best-fit M/L ratio recovering the effective velocity dispersion σ_eff, and the large bust still acceptable M/L = 4 are compared. As in Fig. 9, the plain and dotted light red curves recall the predicted radially biased velocity dispersion profiles in the isolated MOND and Newtonian cases, respectively (cf. Fig. 4).