Cumulative number of individual galaxies with the absolute value of the difference between observed and computed central oxygen abundance less than a given value. The cumulative number is normalized to the total number of galaxies. The computed oxygen abundances come from the linear relation O/H = ﹩f({{{\rm \Sigma}}_{{{L}_{W1}}}})﹩ (Equation (7)) (dotted line), from the parametric relation O/H = ﹩f({{{\rm \Sigma}}_{{{L}_{W1}}}},{{h}_{W1}})﹩ (Equation (8)) (solid line), from the parametric relation O/H = ﹩f({{{\rm \Sigma}}_{{{L}_{W1}}}},{{f}_{B}})﹩ (Equation (9)) (long-dashed line), and from the parametric relation O/H = ﹩f({{{\rm \Sigma}}_{{{L}_{W1}}}},T)﹩ (Equation (10)) (short-dashed line).