Figure 4.

Density plot of the heat noise ${\mathcal{S}}_Q$ (in units of ${\mathcal{S}}_Q^{\left(0\right)}=\omega {\left|\lambda \right|}^2$) as a function of DC voltage amplitude q ($\widehat{x}$-axis) and the AC voltage amplitude $\alpha$ ($\widehat{y}$-axis). Other parameters are: $\eta =0.1$, $\theta =0$ and ${\omega }_{\mathrm{c}}=10\omega$.