Concentration-mass relation (cMr) of simulated dark matter halos, inferred from a spatially uniform sample of 500 halos in the ΛCDM (black curves) and CS-8-0 (Gμ = 10⁻⁸, red curves) runs, as well as from CS-8-0 halos seeded by cosmic string loops (dashed green curves), at redshifts z = 6, 9, and 12. To ensure that individual halos are numerically sufficiently resolved, we only include halos with M_halo ≥ 10¹⁰ M_⊙. Filled circles and error bars indicate the mean and standard deviation of the logarithm of the concentrations log c, respectively, in the corresponding mass bins.