Radius limits imposed by simultaneous moment of inertia and mass measurements, established from eq. (12). Moment of inertia error bands include measurement uncertainties of 10% and systematic uncertainties from eq. (12) and are labeled in units of ﹩M_{\odot }﹩ km². The horizontal error bar illustrates the hypothetical case in which M and I are measured to be 1.34 ﹩M_{\odot }﹩ and ﹩80\pm 8﹩ ﹩M_{\odot }﹩ km², respectively.