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The excitation factors of black hole quasinormal modes quantify the$\textit{ease of excitation}$ of the quasinormal modes and are independent ofthe source of perturbation. We compute the excitation factors of Kerr blackholes up to the 20th overtone and find that the 4th, 5th, and 6th overtoneshave the first three highest excitation factors for intermediate and high spinparameters. This provides an independent confirmation of the importance ofovertones that has been confirmed by the fitting data analysis of numericalrelativity waveforms beginning around the strain peak amplitude.

On the ease of excitation of black hole ringing: Quantifying the importance of overtones by the excitation factors