The stacked mass profiles M(r) of the GAMA groups in each bin in terms of the implied circular velocity ﹩{V}_{c}(r)=\sqrt{GM(r)/r}﹩ (solid blue lines). The blue band indicates the systematic uncertainty from extrapolating ΔΣ_l beyond the last measured data point (Appendix A.2.2). Error bars indicate the statistical uncertainties. Dashed vertical lines indicate the estimated miscentering offsets ﹩\sqrt{\langle {R}_{{\rm{mc}}}^{2}\rangle }﹩ that we correct for. Dashed black lines indicate the V_c we obtain without this miscentering correction. The miscentering correction is valid only at radii significantly larger than the miscentering offset (Appendix A.2.3). Dashed–dotted gray lines indicate the V_c we obtain without subtracting the two-halo term (Appendix A.2.6). Miscentering is important at small radii, and the two-halo term is important at large radii. The shaded black region indicates V_f, its statistical uncertainty, and the radial range from which it is calculated.