Blue lines indicate the real (first row in Figure ) and imaginary (second row) parts of the permittivity of the HQM, which were used for the model of the extinction spectra (third row) that matches the experiments in Figure . A classical permittivity with adjusted f and γ to match the real part (dashed red lines) of the permittivity (first row) recovers the peak splitting (last row), but a shoulder of the rogue peak is still visible. Decreasing the oscillator strength f to match the imaginary part (dashdotted orange lines) successfully suppresses this peak, but also results in a too small peak splitting.