Density estimation with 95% pointwise CI of the fundamental frequencies of the 12 sets coming from the three batches: {X_i} (yellow colors), {Y_i} (blue colors), and {Z_i} (green colors). Estimations of sets from the same batch have the same color. Frequencies are obtained by FA over an interval of 20 Myr centered at 100 Myr in the past (first and third rows) and 200 Myr in the past (second and fourth rows). The time reference is the time of {Z_i}, while the solutions of {X_i} and {Y_i} are shifted ahead by 30 Myr and 20 Myr, respectively.