Table 1.

External and the best-fitted parameters of the function ${\epsilon }_m$ which describes the free-electrons contribution and the frequency-dependent contribution of the interband transitions in gold and silver.

${\mathit{\epsilon }}_{\mathit{m}}$	External	Fitted							Nr
	Interband Contribution						Free electrons Contribution
	$\hslash {\omega }_c$ [eV]	${\epsilon }_{up}$	${\epsilon }_{lo}$	S [1/eV]	A [eV${}^2$]	${\left(\hslash {\gamma }_L\right)}^2$ [eV${}^2$]	${\omega }_p$ [eV]	$\gamma$ [eV]
Au	2.4	5.6	-	5.87	7.78	0.977	8.6	0.072	7
Ag	3.9	6.37–0.54 [1/eV]$·\hslash \omega$	0.1	7.90	4.02	1.00	9.0	0.020	8