Universality test for critical amplitudes in two dimensional percolation

From series expansions estimates of Sykes et al. it is concluded that the ratio $\text{B}{}^{\mathrm{\delta -1}}\text{ГE}{}^{\mathrm{-\delta }}$ for the critical amplitudes corresponding to the critical exponents β, γ and δ, respectively, behaves like a universal quantity, within reasonable bounds, for the site and bond percolation problem.