Intermingled fractal Arnold tongues

We present a pattern of multiply interwoven Arnold tongues in the case of the single-well Duffing oscillator at low dissipation and weak forcing: Strips of $\frac{2}{2}$ Arnold tongues form a truncated fractal structure and the tonguelike regions in between are filled by finely intermingled fractal-like $\frac{1}{1}$ and $\frac{3}{3}$ Arnold tongues, which are fat fractals characterized by the uncertainty exponent $\alpha \approx 0.7$. The truncated fractal Arnold tongues are present in the case of high dissipation as well, while the intermingled fractal pattern gradually disappears with increasing dissipation.