Tidal radii from lensing-based observational inferences (gray line; the shading indicates conservative 5σ uncertainties), overlaid with individual CDM (blue horizontal dashes) and strongly collisional SIDM (red horizontal dashes; conservative upper bounds) predictions for all spectroscopically confirmed member galaxies in our sample. We also plot the respective medians (circles), central 68% ranges (triangles), and central 95% ranges (horizontal bars). Lensing inferences are fully statistically consistent with CDM and discrepant with SIDM.