Fig. 6. The temperature dependence of $R_{xx}$ in the Born-Infeld case. Density plots of ${\rm d}\log_{10}({\rm d}R_{xx}/{\rm d}T)/{\rm d}\log_{10}T$ versus $a$ and $\log_{10}(T/\alpha)$ at various fixed values of $h/\alpha^{2}$ and $\rho/\alpha^{2}$. The fixed $\rho/\alpha^{2}$ for each row, from upper to lower, are set as $0.01$, $1$ and $10$. And the fixed $h/\alpha^{2}$ for each column, from left to right, are set as $0$, $1$ and $10$.
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