**Table 2:** Parameters used for the dielectric function $\delta \epsilon ^{f}$ .
Parameter		Value
Plasma frequency (298 K)^a	$\omega_{\rm p}$ [s^-1]	$5.090\times 10^{15}$
Internal collision rate (298 K)^a	$\Gamma _{\rm i}$ [s^-1]	$2.693\times 10^{13}$
Fermi velocity^b	$v_{\rm F}$ [cm/s]	$1.98\times 10^8$

^a Fit parameters with single Drude term.
^b Taken from Ashcroft & Mermin (1976).

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