Correlation coefficients. (A) Histogram of correlation coefficients between the fit parameters Ex, Z_i, and fdx. The variances of the parameters themselves (correlation coefficient = 1) were omitted. Data are the mean of 100 converging fits. Noise factor 0.5. Most correlation coefficients are −0.3 to 0.3, with few exceptions. An outstanding negative correlation exists between Z₁₅ and E4. For individual values, see Table S4. (B) Histogram of correlation coefficients between the Ex and K_i. The K_i values were calculated from the Z_i values as described in Materials and methods. For individual values, see Table S5.