Cross-correlation between the radial flux (Φ_r) of cycle n and the toroidal flux (Φ_tor) of cycle n, n + 1, n + 2, n + 3 in the diffusion-dominated dynamo. Poloidal field is generated due to both the Babcock–Leighton mechanism and mean-field α effect. Spearman correlation coefficients with significance level are given inside the plots. Here, we consider 60% fluctuations in the Babcock–Leighton mechanism and 50% fluctuation in the mean field α. The value of the mean-field α constant factor S_⊙ is 0.14.