The analyzer transmission function, Scofield's sensitivity factors, and effective attenuation lengths for photoelectrons were applied for quantification. Effective attenuation lengths were calculated using the standard TPP-2M formalism. Core peaks were analyzed using the "smart background" (nonlinear Shirley-type background with an additional constraint that the background function is not greater than any datapoint in the measured region). For peak fitting, Voigt profiles were used with a 70 % Gaussian and 30 % Lorentzian contribution.