Centre-of-mass energy dependence of the high \ptt plateau value of the charged-particle number density in the transverse region. The ATLAS , CDF , CMS  and STAR  data points were taken from the compilation reported by the STAR collaboration . Error bars represent statistical and systematic uncertainties summed in quadrature. The data are compared with a parametrisation of the form $s^{0.27}+0.14\log(s)$ .