Figure also shows that indeed, to recover the measured peak splitting for all particle sizes with the classical model, each particle size requires a new set of parameters due to the varying coupling strength. In previous classical simulations, different linewidths for the same dye needed to be assumed to model spectra for different coupling strengths. The HQM elegantly removes this necessity and for all particle sizes, the dye parameters can be kept constant and only the (measured) coupling strength is used as varying parameter.