Fig. 5. The temperature dependence of $R_{xx}$ in the Born-Infeld case with $a=-1$. Upper Row: Density plots of ${\rm d}\log_{10} ({\rm d}R_{xx}/{\rm d}T)/{\rm d}\log_{10}T$ versus $\rho/\alpha^{2}$ and $\log_{10}(T/\alpha)$ at fixed $h/\alpha^{2}=0$, $1$ and $10$ from left to right. Lower Row: Density plots of ${\rm d}\log_{10}({\rm d}R_{xx}/{\rm d}T)/{\rm d}\log_{10}T$ versus $h/\alpha^{2}$ and $\log_{10}(T/\alpha)$ at fixed $\rho/\alpha^{2}=0$, $1$ and $10$ from left to right.
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