FIG. 3.

(Color online) Transmission loss $\mathrm{T}({\Omega }_0,\omega )$, 1/12 octave smoothed, of the different masks for frontal sound radiation ${\Omega }_0=(\varphi =0°,\theta =0°)$ (left), and averaged over all directions ${\mathrm{T}}_{\text{avg}}(\omega )$ (right).