Figure 5.

Velocity mechanism for multitudinous values of ${\varphi }_{\mathrm{Gold}}, {\varphi }_{\mathrm{Copper}}$. Black line is for ${\varphi }_{\mathrm{Gold}}=0, {\varphi }_{\mathrm{Copper}}=0.1$, Red line is for ${\varphi }_{\mathrm{Gold}}=0.1, {\varphi }_{\mathrm{Copper}}=0$, Green line is for ${\varphi }_{\mathrm{Gold}}=0.3, {\varphi }_{\mathrm{Copper}}=0.3$.