Acoustic descriptors (see Tab. 1) for exterior (microphone at 7.5 m, open symbols) and interior (HATS, closed symbols) recordings, and both vehicle types (encoded by the color). Shown are a) the A-weighted equivalent sound pressure level L_Aeq, b) the peak loudness level L_N5, c) the L_Ceq, d) the peak tonality T₅, e) the peak Aures sharpness S_A5, f) the peak roughness R₅, and g) the peak DIN-sharpness S_D5. The error bars show the 95% confidence intervals.