Concentration-mass relation. The c₅₀₀ is derived from the DF NFW model. Blue and red solid lines represent the theoretical relations from the suite of cosmological simulations of Dutton & Macciò (2014). Dotted lines represent the 30% scatter (Bhattacharya et al. 2013) for the z = 1 relation. The concentration of SPT–CL J2106–5844 is not reported because the data radial coverage does not allow a robust determination of c₅₀₀.